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This is an implementation of decimal floating point arithmetic based on
the General Decimal Arithmetic Specification:
http://speleotrove.com/decimal/decarith.html
and IEEE standard 854-1987:
http://en.wikipedia.org/wiki/IEEE_854-1987
Decimal floating point has finite precision with arbitrarily large bounds.
The purpose of this module is to support arithmetic using familiar
"schoolhouse" rules and to avoid some of the tricky representation
issues associated with binary floating point. The package is especially
useful for financial applications or for contexts where users have
expectations that are at odds with binary floating point (for instance,
in binary floating point, 1.00 % 0.1 gives 0.09999999999999995 instead
of 0.0; Decimal('1.00') % Decimal('0.1') returns the expected
Decimal('0.00')).
Here are some examples of using the decimal module:
>>> from decimal import *
>>> setcontext(ExtendedContext)
>>> Decimal(0)
Decimal('0')
>>> Decimal('1')
Decimal('1')
>>> Decimal('-.0123')
Decimal('-0.0123')
>>> Decimal(123456)
Decimal('123456')
>>> Decimal('123.45e12345678')
Decimal('1.2345E+12345680')
>>> Decimal('1.33') + Decimal('1.27')
Decimal('2.60')
>>> Decimal('12.34') + Decimal('3.87') - Decimal('18.41')
Decimal('-2.20')
>>> dig = Decimal(1)
>>> print(dig / Decimal(3))
0.333333333
>>> getcontext().prec = 18
>>> print(dig / Decimal(3))
0.333333333333333333
>>> print(dig.sqrt())
1
>>> print(Decimal(3).sqrt())
1.73205080756887729
>>> print(Decimal(3) ** 123)
4.85192780976896427E+58
>>> inf = Decimal(1) / Decimal(0)
>>> print(inf)
Infinity
>>> neginf = Decimal(-1) / Decimal(0)
>>> print(neginf)
-Infinity
>>> print(neginf + inf)
NaN
>>> print(neginf * inf)
-Infinity
>>> print(dig / 0)
Infinity
>>> getcontext().traps[DivisionByZero] = 1
>>> print(dig / 0)
Traceback (most recent call last):
...
...
...
decimal.DivisionByZero: x / 0
>>> c = Context()
>>> c.traps[InvalidOperation] = 0
>>> print(c.flags[InvalidOperation])
0
>>> c.divide(Decimal(0), Decimal(0))
Decimal('NaN')
>>> c.traps[InvalidOperation] = 1
>>> print(c.flags[InvalidOperation])
1
>>> c.flags[InvalidOperation] = 0
>>> print(c.flags[InvalidOperation])
0
>>> print(c.divide(Decimal(0), Decimal(0)))
Traceback (most recent call last):
...
...
...
decimal.InvalidOperation: 0 / 0
>>> print(c.flags[InvalidOperation])
1
>>> c.flags[InvalidOperation] = 0
>>> c.traps[InvalidOperation] = 0
>>> print(c.divide(Decimal(0), Decimal(0)))
NaN
>>> print(c.flags[InvalidOperation])
1
>>>
DecimalContext DecimalTupleDefaultContext BasicContextExtendedContextDecimalExceptionClampedInvalidOperationDivisionByZeroInexactRounded SubnormalOverflow UnderflowFloatOperationDivisionImpossibleInvalidContextConversionSyntaxDivisionUndefined
ROUND_DOWN
ROUND_HALF_UPROUND_HALF_EVEN
ROUND_CEILING ROUND_FLOORROUND_UPROUND_HALF_DOWN
ROUND_05UP
setcontext
getcontext localcontextMAX_PRECMAX_EMAXMIN_EMIN MIN_ETINY HAVE_THREADSHAVE_CONTEXTVARZdecimalz1.70z2.4.2 N)
namedtuplezsign digits exponentc G s | S N )argsr) r) )/opt/python38/lib/python3.8/_pydecimal.py r, Tl l NZolNZoi@Ti c @ s e Zd ZdZdd ZdS )r a1 Base exception class.
Used exceptions derive from this.
If an exception derives from another exception besides this (such as
Underflow (Inexact, Rounded, Subnormal) that indicates that it is only
called if the others are present. This isn't actually used for
anything, though.
handle -- Called when context._raise_error is called and the
trap_enabler is not set. First argument is self, second is the
context. More arguments can be given, those being after
the explanation in _raise_error (For example,
context._raise_error(NewError, '(-x)!', self._sign) would
call NewError().handle(context, self._sign).)
To define a new exception, it should be sufficient to have it derive
from DecimalException.
c G s d S r( r) selfcontextr* r) r) r+ handle s zDecimalException.handleN__name__
__module__ __qualname____doc__r2 r) r) r) r+ r s c @ s e Zd ZdZdS )r a) Exponent of a 0 changed to fit bounds.
This occurs and signals clamped if the exponent of a result has been
altered in order to fit the constraints of a specific concrete
representation. This may occur when the exponent of a zero result would
be outside the bounds of a representation, or when a large normal
number would have an encoded exponent that cannot be represented. In
this latter case, the exponent is reduced to fit and the corresponding
number of zero digits are appended to the coefficient ("fold-down").
Nr4 r5 r6 r7 r) r) r) r+ r s c @ s e Zd ZdZdd ZdS )r a0 An invalid operation was performed.
Various bad things cause this:
Something creates a signaling NaN
-INF + INF
0 * (+-)INF
(+-)INF / (+-)INF
x % 0
(+-)INF % x
x._rescale( non-integer )
sqrt(-x) , x > 0
0 ** 0
x ** (non-integer)
x ** (+-)INF
An operand is invalid
The result of the operation after these is a quiet positive NaN,
except when the cause is a signaling NaN, in which case the result is
also a quiet NaN, but with the original sign, and an optional
diagnostic information.
c G s, |r(t |d j|d jdd}||S tS )Nr& nT)_dec_from_triple_sign_int_fix_nan_NaN)r0 r1 r* ansr) r) r+ r2 s
zInvalidOperation.handleNr3 r) r) r) r+ r s c @ s e Zd ZdZdd ZdS )r zTrying to convert badly formed string.
This occurs and signals invalid-operation if a string is being
converted to a number and it does not conform to the numeric string
syntax. The result is [0,qNaN].
c G s t S r( r> r/ r) r) r+ r2 s zConversionSyntax.handleNr3 r) r) r) r+ r s c @ s e Zd ZdZdd ZdS )r
a Division by 0.
This occurs and signals division-by-zero if division of a finite number
by zero was attempted (during a divide-integer or divide operation, or a
power operation with negative right-hand operand), and the dividend was
not zero.
The result of the operation is [sign,inf], where sign is the exclusive
or of the signs of the operands for divide, or is 1 for an odd power of
-0, for power.
c G s t | S r( )_SignedInfinityr0 r1 signr* r) r) r+ r2 s zDivisionByZero.handleNr3 r) r) r) r+ r
s c @ s e Zd ZdZdd ZdS )r zCannot perform the division adequately.
This occurs and signals invalid-operation if the integer result of a
divide-integer or remainder operation had too many digits (would be
longer than precision). The result is [0,qNaN].
c G s t S r( r@ r/ r) r) r+ r2 " s zDivisionImpossible.handleNr3 r) r) r) r+ r s c @ s e Zd ZdZdd ZdS )r zUndefined result of division.
This occurs and signals invalid-operation if division by zero was
attempted (during a divide-integer, divide, or remainder operation), and
the dividend is also zero. The result is [0,qNaN].
c G s t S r( r@ r/ r) r) r+ r2 - s zDivisionUndefined.handleNr3 r) r) r) r+ r % s c @ s e Zd ZdZdS )r a Had to round, losing information.
This occurs and signals inexact whenever the result of an operation is
not exact (that is, it needed to be rounded and any discarded digits
were non-zero), or if an overflow or underflow condition occurs. The
result in all cases is unchanged.
The inexact signal may be tested (or trapped) to determine if a given
operation (or sequence of operations) was inexact.
Nr8 r) r) r) r+ r 0 s c @ s e Zd ZdZdd ZdS )r a Invalid context. Unknown rounding, for example.
This occurs and signals invalid-operation if an invalid context was
detected during an operation. This can occur if contexts are not checked
on creation and either the precision exceeds the capability of the
underlying concrete representation or an unknown or unsupported rounding
was specified. These aspects of the context need only be checked when
the values are required to be used. The result is [0,qNaN].
c G s t S r( r@ r/ r) r) r+ r2 G s zInvalidContext.handleNr3 r) r) r) r+ r < s
c @ s e Zd ZdZdS )r a Number got rounded (not necessarily changed during rounding).
This occurs and signals rounded whenever the result of an operation is
rounded (that is, some zero or non-zero digits were discarded from the
coefficient), or if an overflow or underflow condition occurs. The
result in all cases is unchanged.
The rounded signal may be tested (or trapped) to determine if a given
operation (or sequence of operations) caused a loss of precision.
Nr8 r) r) r) r+ r J s c @ s e Zd ZdZdS )r
a Exponent < Emin before rounding.
This occurs and signals subnormal whenever the result of a conversion or
operation is subnormal (that is, its adjusted exponent is less than
Emin, before any rounding). The result in all cases is unchanged.
The subnormal signal may be tested (or trapped) to determine if a given
or operation (or sequence of operations) yielded a subnormal result.
Nr8 r) r) r) r+ r
V s c @ s e Zd ZdZdd ZdS )r a Numerical overflow.
This occurs and signals overflow if the adjusted exponent of a result
(from a conversion or from an operation that is not an attempt to divide
by zero), after rounding, would be greater than the largest value that
can be handled by the implementation (the value Emax).
The result depends on the rounding mode:
For round-half-up and round-half-even (and for round-half-down and
round-up, if implemented), the result of the operation is [sign,inf],
where sign is the sign of the intermediate result. For round-down, the
result is the largest finite number that can be represented in the
current precision, with the sign of the intermediate result. For
round-ceiling, the result is the same as for round-down if the sign of
the intermediate result is 1, or is [0,inf] otherwise. For round-floor,
the result is the same as for round-down if the sign of the intermediate
result is 0, or is [1,inf] otherwise. In all cases, Inexact and Rounded
will also be raised.
c G s |j ttttfkrt| S |dkrR|j tkr4t| S t|d|j |j |j d S |dkr|j t
krlt| S t|d|j |j |j d S d S )Nr& 9r. ) roundingr r r r rA r r: precEmaxr rB r) r) r+ r2 w s"
zOverflow.handleNr3 r) r) r) r+ r a s c @ s e Zd ZdZdS )r ax Numerical underflow with result rounded to 0.
This occurs and signals underflow if a result is inexact and the
adjusted exponent of the result would be smaller (more negative) than
the smallest value that can be handled by the implementation (the value
Emin). That is, the result is both inexact and subnormal.
The result after an underflow will be a subnormal number rounded, if
necessary, so that its exponent is not less than Etiny. This may result
in 0 with the sign of the intermediate result and an exponent of Etiny.
In all cases, Inexact, Rounded, and Subnormal will also be raised.
Nr8 r) r) r) r+ r s c @ s e Zd ZdZdS )r a Enable stricter semantics for mixing floats and Decimals.
If the signal is not trapped (default), mixing floats and Decimals is
permitted in the Decimal() constructor, context.create_decimal() and
all comparison operators. Both conversion and comparisons are exact.
Any occurrence of a mixed operation is silently recorded by setting
FloatOperation in the context flags. Explicit conversions with
Decimal.from_float() or context.create_decimal_from_float() do not
set the flag.
Otherwise (the signal is trapped), only equality comparisons and explicit
conversions are silent. All other mixed operations raise FloatOperation.
Nr8 r) r) r) r+ r s Zdecimal_contextc C s8 z
t W S tk
r2 t } t | | Y S X dS )zReturns this thread's context.
If this thread does not yet have a context, returns
a new context and sets this thread's context.
New contexts are copies of DefaultContext.
N)_current_context_varget LookupErrorr setr1 r) r) r+ r s
c C s, | t ttfkr | } | t| dS )z%Set this thread's context to context.N)r r r copy clear_flagsrH rK rL r) r) r+ r s c C s | dkrt } t| S )ab Return a context manager for a copy of the supplied context
Uses a copy of the current context if no context is specified
The returned context manager creates a local decimal context
in a with statement:
def sin(x):
with localcontext() as ctx:
ctx.prec += 2
# Rest of sin calculation algorithm
# uses a precision 2 greater than normal
return +s # Convert result to normal precision
def sin(x):
with localcontext(ExtendedContext):
# Rest of sin calculation algorithm
# uses the Extended Context from the
# General Decimal Arithmetic Specification
return +s # Convert result to normal context
>>> setcontext(DefaultContext)
>>> print(getcontext().prec)
28
>>> with localcontext():
... ctx = getcontext()
... ctx.prec += 2
... print(ctx.prec)
...
30
>>> with localcontext(ExtendedContext):
... print(getcontext().prec)
...
9
>>> print(getcontext().prec)
28
N)r _ContextManager)ctxr) r) r+ r s $ c
@ s e Zd ZdZdZdddZedd Zd d
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dddZdddZdddZddd Zdd d Zdd d Zd!d" Zd#d$ Zd%d& Zd'd( Zdd*d+Zdd,d-Zdd.d/Zdd0d1Zdd3d4Z dd5d6Z e Z d d7d8Z dd9d:Z dd;d<Z!e!Z"dd=d>Z#d?d@ Z$ddAdBZ%ddCdDZ&ddEdFZ'ddGdHZ(ddIdJZ)d dKdLZ*d
dMdNZ+d dOdPZ,dQdR Z-dSdT Z.e.Z/e0dUdV Z1e0dWdX Z2dYdZ Z3d[d\ Z4d]d^ Z5d_d` Z6dadb Z7dcdd Z8dedf Z9dgdh Z:didj Z;dkdl Ze?e7e8e9e:e;edqZ@d drdsZAdtdu ZBdvdw ZCd
dxdyZDddzd{ZEd|d} ZFdd~dZGdddZHdddZIdddZJdddZKdd ZLdd ZMdddZNdddZOeOZPdddZQdddZRdddZSdd ZTdd ZUdd ZVdd ZWdddZXdddZYdddZZdd Z[dd Z\d ddZ]d ddZ^dd Z_dd Z`dd Zadd Zbd ddZcdd Zddd Zedd Zfd ddZgdd Zhdd Zid ddÄZjddń Zkd!ddDŽZld"ddɄZmdd˄ Zndd̈́ Zod#ddτZpd$ddфZqd%ddӄZrd&ddՄZsd'ddׄZtd(ddلZud)ddۄZvd*dd݄Zwd+dd߄Zxd,ddZydd Zzd-ddZ{d.ddZ|d/ddZ}dd Z~dd Zdd Zd0ddZdS (1 r z,Floating point class for decimal arithmetic.)_expr< r; _is_special0Nc C s t | }t|tr$t| dd}|dkrP|dkr@t }|t d| S |
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|d |_d
|_ntd |S t|t rx|dkr>t }|t d t |}|j|_|j |_ |j
|_
|j|_|S t d | dS ) a Create a decimal point instance.
>>> Decimal('3.14') # string input
Decimal('3.14')
>>> Decimal((0, (3, 1, 4), -2)) # tuple (sign, digit_tuple, exponent)
Decimal('3.14')
>>> Decimal(314) # int
Decimal('314')
>>> Decimal(Decimal(314)) # another decimal instance
Decimal('314')
>>> Decimal(' 3.14 \n') # leading and trailing whitespace okay
Decimal('3.14')
_ Nz Invalid literal for Decimal: %rrC -r. r& intZfracexprS FdiagsignalNr9 FT ztInvalid tuple size in creation of Decimal from list or tuple. The list or tuple should have exactly three elements.r& r. z|Invalid sign. The first value in the tuple should be an integer; either 0 for a positive number or 1 for a negative number. zTThe second value in the tuple must be composed of integers in the range 0 through 9.r9 r[ zUThe third value in the tuple must be an integer, or one of the strings 'F', 'n', 'N'.;strict semantics for mixing floats and Decimals are enabledz Cannot convert %r to Decimal)!object__new__
isinstancestr_parserstripreplacer _raise_errorr groupr; rW r< lenrQ rR lstripabsr _WorkReprC rX listtuple
ValueErrorappendjoinmapfloatr
from_float TypeError) clsvaluer1 r0 mintpartfracpartrX rY digitsZdigitr) r) r+ rd
s
(
zDecimal.__new__c C s t |tr,|dkrdnd}d}tt|}nzt |trt|sJt|rV| t|S t d|dkrld}nd}t|
\}}| d }t|d| }nt dt
||| }| tkr|S | |S dS )a. Converts a float to a decimal number, exactly.
Note that Decimal.from_float(0.1) is not the same as Decimal('0.1').
Since 0.1 is not exactly representable in binary floating point, the
value is stored as the nearest representable value which is
0x1.999999999999ap-4. The exact equivalent of the value in decimal
is 0.1000000000000000055511151231257827021181583404541015625.
>>> Decimal.from_float(0.1)
Decimal('0.1000000000000000055511151231257827021181583404541015625')
>>> Decimal.from_float(float('nan'))
Decimal('NaN')
>>> Decimal.from_float(float('inf'))
Decimal('Infinity')
>>> Decimal.from_float(-float('inf'))
Decimal('-Infinity')
>>> Decimal.from_float(-0.0)
Decimal('-0')
r& r. g ? z argument must be int or float.N)re rW rf rn rv _mathisinfisnanreprcopysignas_integer_ratio
bit_lengthrx r: r )ry frC kcoeffr9 dresultr) r) r+ rw s$
zDecimal.from_floatc C s( | j r$| j}|dkrdS |dkr$dS dS )zrReturns whether the number is not actually one.
0 if a number
1 if NaN
2 if sNaN
r9 r. r[ r_ r& )rR rQ )r0 rX r) r) r+ _isnan s zDecimal._isnanc C s | j dkr| jrdS dS dS )zyReturns whether the number is infinite
0 if finite or not a number
1 if +INF
-1 if -INF
r\ r. r& )rQ r; r0 r) r) r+ _isinfinity s
zDecimal._isinfinityc C s| | }|dkrd}n| }|s&|rx|dkr4t }|dkrJ|td| S |dkr`|td|S |rn| |S ||S dS )zReturns whether the number is not actually one.
if self, other are sNaN, signal
if self, other are NaN return nan
return 0
Done before operations.
NFr_ sNaNr& )r r rj r r= )r0 otherr1 self_is_nan other_is_nanr) r) r+ _check_nans s&
zDecimal._check_nansc C sv |dkrt }| js|jrr| r0|td| S | rF|td|S | r\|td| S | rr|td|S dS )aC Version of _check_nans used for the signaling comparisons
compare_signal, __le__, __lt__, __ge__, __gt__.
Signal InvalidOperation if either self or other is a (quiet
or signaling) NaN. Signaling NaNs take precedence over quiet
NaNs.
Return 0 if neither operand is a NaN.
Nzcomparison involving sNaNzcomparison involving NaNr& )r rR is_snanrj r is_qnanr0 r r1 r) r) r+ _compare_check_nans s0 zDecimal._compare_check_nansc C s | j p| jdkS )zuReturn True if self is nonzero; otherwise return False.
NaNs and infinities are considered nonzero.
rS rR r< r r) r) r+ __bool__* s zDecimal.__bool__c C s | j s |j r8| }| }||kr(dS ||k r4dS dS | sP|sDdS d|j S |s^d| j S |j| jk rndS | j|jk r~dS | }| }||kr| jd| j|j }|jd|j| j }||krdS ||k rd| j S d| j S n ||krd| j S d| j S dS )zCompare the two non-NaN decimal instances self and other.
Returns -1 if self < other, 0 if self == other and 1
if self > other. This routine is for internal use only.r& r r. rS N)rR r r; adjustedr< rQ )r0 r Zself_infZ other_inf
self_adjustedZother_adjusted self_paddedZ other_paddedr) r) r+ _cmp1 s>
z Decimal._cmpc C s< t | |dd\} }|tkr |S | ||r.dS | |dkS )NT) equality_opFr& )_convert_for_comparisonNotImplementedr r r r) r) r+ __eq__q s zDecimal.__eq__c C s< t | |\} }|tkr|S | ||}|r.dS | |dk S NFr& r r r r r0 r r1 r? r) r) r+ __lt__y s zDecimal.__lt__c C s< t | |\} }|tkr|S | ||}|r.dS | |dkS r r r r) r) r+ __le__ s zDecimal.__le__c C s< t | |\} }|tkr|S | ||}|r.dS | |dkS r r r r) r) r+ __gt__ s zDecimal.__gt__c C s< t | |\} }|tkr|S | ||}|r.dS | |dkS r r r r) r) r+ __ge__ s zDecimal.__ge__c C s> t |dd}| js |r0|jr0| ||}|r0|S t| |S )zCompare self to other. Return a decimal value:
a or b is a NaN ==> Decimal('NaN')
a < b ==> Decimal('-1')
a == b ==> Decimal('0')
a > b ==> Decimal('1')
Traiseit)_convert_otherrR r r r r r) r) r+ compare s zDecimal.comparec C s | j r4| rtdn | r$tS | jr0t S tS | jdkrNtd| jt }ntt
| j t }t | j | t }| dkr||n| }|dkrdS |S )zx.__hash__() <==> hash(x)z"Cannot hash a signaling NaN value.r&
r )
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zDecimal.__hash__c C s t | jttt| j| jS )zeRepresents the number as a triple tuple.
To show the internals exactly as they are.
)r r; rq ru rW r< rQ r r) r) r+ as_tuple s zDecimal.as_tuplec C s | j r | rtdntd| s(dS t| j}| jdkrR|d| j d }}nn| j }|dkr|d dkr|d }|d8 }qZ| j }t|| @ d |}|r||L }||8 }d| |> }| j r| }||fS )a Express a finite Decimal instance in the form n / d.
Returns a pair (n, d) of integers. When called on an infinity
or NaN, raises OverflowError or ValueError respectively.
>>> Decimal('3.14').as_integer_ratio()
(157, 50)
>>> Decimal('-123e5').as_integer_ratio()
(-12300000, 1)
>>> Decimal('0.00').as_integer_ratio()
(0, 1)
z#cannot convert NaN to integer ratioz(cannot convert Infinity to integer ratior^ r& r r. r )
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zDecimal.as_integer_ratioc C s dt | S )z0Represents the number as an instance of Decimal.z
Decimal('%s'))rf r r) r) r+ __repr__ s zDecimal.__repr__Fc C sb ddg| j }| jrL| jdkr&|d S | jdkr>|d | j S |d | j S | jt| j }| jdkrt|d krt|}n6|s~d
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Captures all of the information in the underlying representation.
rU rV r\ ZInfinityr9 NaNr r& r. rS r] .NeEz%+d)r; rR rQ r< rl r capitals) r0 engr1 rC
leftdigitsdotplacer| r} rX r) r) r+ __str__ s:
zDecimal.__str__c C s | j d|dS )a, Convert to a string, using engineering notation if an exponent is needed.
Engineering notation has an exponent which is a multiple of 3. This
can leave up to 3 digits to the left of the decimal place and may
require the addition of either one or two trailing zeros.
T)r r1 )r r0 r1 r) r) r+
to_eng_string; s zDecimal.to_eng_stringc C sR | j r| j|d}|r|S |dkr(t }| s@|jtkr@| }n| }||S )zRReturns a copy with the sign switched.
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rL N)rR r r rE r copy_abs copy_negate_fixr0 r1 r? r) r) r+ __neg__D s
zDecimal.__neg__c C sR | j r| j|d}|r|S |dkr(t }| s@|jtkr@| }nt| }||S )zhReturns a copy, unless it is a sNaN.
Rounds the number (if more than precision digits)
rL N)rR r r rE r r r r r r) r) r+ __pos__Z s
zDecimal.__pos__Tc C sJ |s | S | jr&| j|d}|r&|S | jr:| j|d}n | j|d}|S )zReturns the absolute value of self.
If the keyword argument 'round' is false, do not round. The
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self.copy_abs().
rL )r rR r r; r r )r0 roundr1 r? r) r) r+ __abs__o s zDecimal.__abs__c
C sh t |}|tkr|S |dkr"t }| js.|jr| ||}|rB|S | rr| j|jkrj| rj|tdS t | S | rt |S t
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| j|j}|rd}t|d|}||}|S | s t||j |j d }|||j }||}|S |sVt|| j |j d }| ||j }||}|S t| }t|}t|||j\}}t } |j|jkr|j|jkrt|d|}||}|S |j|jk r|| }}|jdkrd| _|j|j |_|_nd| _n&|jdkrd| _d\|_|_nd| _|jdkr<|j|j | _n|j|j | _|j| _t | }||}|S )zbReturns self + other.
-INF + INF (or the reverse) cause InvalidOperation errors.
Nz
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zDecimal.__add__c C sH t |}|tkr|S | js |jr6| j||d}|r6|S | j| |dS )zReturn self - otherrL )r r rR r r r r r) r) r+ __sub__ s zDecimal.__sub__c C s" t |}|tkr|S |j| |dS )zReturn other - selfrL )r r r r r) r) r+ __rsub__ s zDecimal.__rsub__c C s@ t |}|tkr|S |dkr"t }| j|jA }| js:|jr| ||}|rN|S | rn|sf|tdS t | S | r| s|tdS t | S | j
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(+-) INF * 0 (or its reverse) raise InvalidOperation.
Nz (+-)INF * 0z 0 * (+-)INFrS 1)r r r r; rR r r rj r rA rQ r: r r< ro rf rW )r0 r r1 Z
resultsignr? Z resultexpr r r) r) r+ __mul__ sH
zDecimal.__mul__c C s t |}|tkrtS |dkr"t }| j|jA }| js:|jr| ||}|rN|S | rj| rj|tdS | rzt | S | r|t
d t |d| S |s| s|t
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zDecimal.__truediv__c C s | j |j A }| r | j}nt| j|j}| | }| rN| sN|dkrht|dd| ||jfS ||jkr
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Assumes that neither self nor other is a NaN, that self is not
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zDecimal._dividec C s" t |}|tkr|S |j| |dS )z)Swaps self/other and returns __truediv__.rL )r r r r r) r) r+ __rtruediv__ s zDecimal.__rtruediv__c C s t |}|tkr|S |dkr"t }| ||}|r:||fS | j|jA }| r~| rj|td}||fS t| |tdfS |s| s|t d}||fS |t
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Nzdivmod(INF, INF)INF % xz divmod(0, 0)x // 0x % 0)
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Remainder nearest to 0- abs(remainder-near) <= other/2
NTr zremainder_near(infinity, x)zremainder_near(x, 0)zremainder_near(0, 0)rS r. r r r_ r& )r r r r rj r r r r r rQ r: r; r rF r r rE ro rX rW r rf ) r0 r r1 r? ideal_exponentr r r r r rC r) r) r+ remainder_near s`
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zDecimal.__int__c C s | S r( r) r r) r) r+ realc s z Decimal.realc C s t dS )Nr& r r r) r) r+ imagg s z Decimal.imagc C s | S r( r) r r) r) r+ conjugatek s zDecimal.conjugatec C s t t| S r( )complexrv r r) r) r+ __complex__n s zDecimal.__complex__c C sR | j }|j|j }t||krJ|t|| d d}t| j|| jdS t| S )z2Decapitate the payload of a NaN to fit the contextNrS T) r< rF clamprl rm r: r; rQ r )r0 r1 payloadZmax_payload_lenr) r) r+ r= q s zDecimal._fix_nanc C sX | j r | r| |S t| S | }| }| s|j|g|j }tt | j
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|S t| S )zRound if it is necessary to keep self within prec precision.
Rounds and fixes the exponent. Does not raise on a sNaN.
Arguments:
self - Decimal instance
context - context used.
rS
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zDecimal._round_half_upc C s t | j|rdS | |S dS )z Round 5 downr N _exact_halfr< r r r) r) r+ _round_half_down s zDecimal._round_half_downc C s8 t | j|r*|dks&| j|d dkr*dS | |S dS )z!Round 5 to even, rest to nearest.r& r. 02468r Nr r r) r) r+ _round_half_even s zDecimal._round_half_evenc C s | j r| |S | | S dS )z(Rounds up (not away from 0 if negative.)Nr; r r r) r) r+ _round_ceiling s
zDecimal._round_ceilingc C s | j s| |S | | S dS )z'Rounds down (not towards 0 if negative)Nr r r) r) r+ _round_floor
s
zDecimal._round_floorc C s0 |r | j |d dkr | |S | | S dS )z)Round down unless digit prec-1 is 0 or 5.r. Z05N)r< r r r) r) r+ _round_05up s
zDecimal._round_05up)r r r r r r r r c C sb |dk r2t |tstdtdd| }| |S | jrR| rJtdntdt| dt
S )a Round self to the nearest integer, or to a given precision.
If only one argument is supplied, round a finite Decimal
instance self to the nearest integer. If self is infinite or
a NaN then a Python exception is raised. If self is finite
and lies exactly halfway between two integers then it is
rounded to the integer with even last digit.
>>> round(Decimal('123.456'))
123
>>> round(Decimal('-456.789'))
-457
>>> round(Decimal('-3.0'))
-3
>>> round(Decimal('2.5'))
2
>>> round(Decimal('3.5'))
4
>>> round(Decimal('Inf'))
Traceback (most recent call last):
...
OverflowError: cannot round an infinity
>>> round(Decimal('NaN'))
Traceback (most recent call last):
...
ValueError: cannot round a NaN
If a second argument n is supplied, self is rounded to n
decimal places using the rounding mode for the current
context.
For an integer n, round(self, -n) is exactly equivalent to
self.quantize(Decimal('1En')).
>>> round(Decimal('123.456'), 0)
Decimal('123')
>>> round(Decimal('123.456'), 2)
Decimal('123.46')
>>> round(Decimal('123.456'), -2)
Decimal('1E+2')
>>> round(Decimal('-Infinity'), 37)
Decimal('NaN')
>>> round(Decimal('sNaN123'), 0)
Decimal('NaN123')
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zDecimal.__round__c C s0 | j r | rtdntdt| dtS )zReturn the floor of self, as an integer.
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r r r& )rR r rr r rW r r r r) r) r+ __floor__d s
zDecimal.__floor__c C s0 | j r | rtdntdt| dtS )zReturn the ceiling of self, as an integer.
For a finite Decimal instance self, return the least integer n
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Python exception is raised.
r r r& )rR r rr r rW r r r r) r) r+ __ceil__s s
zDecimal.__ceil__c C s t |dd}t |dd}| js$|jr|dkr2t }| jdkrJ|td| S |jdkrb|td|S | jdkrr| }nf|jdkr|}nV| jdkr|s|tdS t| j|jA }n*|jdkr| s|td S t| j|jA }n0t| j|jA t t
| j t
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a: Fused multiply-add.
Returns self*other+third with no rounding of the intermediate
product self*other.
self and other are multiplied together, with no rounding of
the result. The third operand is then added to the result,
and a single final rounding is performed.
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z Decimal.fmac C s t |}|tkr|S t |}|tkr(|S |dkr6t }| }| }| }|sZ|sZ|r|dkrp|td| S |dkr|td|S |dkr|td|S |r| |S |r||S ||S | r| r| s|tdS |dk r|tdS |s |tdS | |j kr(|tdS |s@| s@|td S |
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t| |
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|j }|j }|j |d dkr||k r|d7 }|d8 }qtt|j|j d| |S )z?Normalize- strip trailing 0s, change anything equal to 0 to 0e0NrL rS r& r. )
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zDecimal.normalizec C s t |dd}|dkrt }|dkr(|j}| js4|jr|| ||}|rH|S | sX| r|| rp| rpt| S |tdS | |j
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zQuantize self so its exponent is the same as that of exp.
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zDecimal.quantizec C sD t |dd}| js|jr8| r(| p6| o6| S | j|jkS )a= Return True if self and other have the same exponent; otherwise
return False.
If either operand is a special value, the following rules are used:
* return True if both operands are infinities
* return True if both operands are NaNs
* otherwise, return False.
Tr )r rR r is_infiniterQ r r) r) r+ same_quantum%
s zDecimal.same_quantumc C s | j rt| S | s t| jd|S | j|krHt| j| jd| j| |S t| j| j | }|dk rzt| jd|d } d}| j| }|| |}| jd| pd}|dkrtt |d }t| j||S )as Rescale self so that the exponent is exp, either by padding with zeros
or by truncating digits, using the given rounding mode.
Specials are returned without change. This operation is
quiet: it raises no flags, and uses no information from the
context.
exp = exp to scale to (an integer)
rounding = rounding mode
rS r& r r. N)
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zDecimal._rescalec C sf |dkrt d| js| s"t| S | | d | |}| | krb|| d | |}|S )a" Round a nonzero, nonspecial Decimal to a fixed number of
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information from the context.
r& z'argument should be at least 1 in _roundr. )rr rR r r r )r0 placesrE r? r) r) r+ _roundV
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| t |S )aV Rounds to a nearby integer.
If no rounding mode is specified, take the rounding mode from
the context. This method raises the Rounded and Inexact flags
when appropriate.
See also: to_integral_value, which does exactly the same as
this method except that it doesn't raise Inexact or Rounded.
rL r& rS N) rR r r rQ r: r; r rE r rj r r r0 rE r1 r? r) r) r+ to_integral_exactm
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dS |j d }t | }|j
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|_|S ) z Return the square root of self.NrL r& rS r_ r. zsqrt(-x), x > 0r r& Tr )r rR r r r; r r: rQ r rj r rF ro rX rW rl r< r rf
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s^
z Decimal.sqrtc C s t |dd}|dkrt }| js&|jr~| }| }|s>|r~|dkrX|dkrX| |S |dkrr|dkrr||S | ||S | |}|dkr| |}|dkr|}n| }||S )zReturns the larger value.
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NaN (and signals if one is sNaN). Also rounds.
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compare_totalr0 r r1 ZsnZonrL r? r) r) r+ r s&
z Decimal.maxc C s t |dd}|dkrt }| js&|jr~| }| }|s>|r~|dkrX|dkrX| |S |dkrr|dkrr||S | ||S | |}|dkr| |}|dkr| }n|}||S )zReturns the smaller value.
Like min(self, other) except if one is not a number, returns
NaN (and signals if one is sNaN). Also rounds.
Tr Nr. r& r rO rQ r) r) r+ r * s&
z Decimal.minc C s8 | j r
dS | jdkrdS | j| jd }|dt| kS )z"Returns whether self is an integerFr& TNrS )rR rQ r< rl )r0 restr) r) r+ r L s
zDecimal._isintegerc C s& | r| j dkrdS | jd| j dkS )z:Returns True if self is even. Assumes self is an integer.r& Tr r )rQ r< r r) r) r+ r U s zDecimal._isevenc C s2 z| j t| j d W S tk
r, Y dS X dS )z$Return the adjusted exponent of selfr. r& N)rQ rl r< rx r r) r) r+ r [ s zDecimal.adjustedc C s | S )zReturns the same Decimal object.
As we do not have different encodings for the same number, the
received object already is in its canonical form.
r) r r) r) r+ canonicalc s zDecimal.canonicalc C s. t |dd}| ||}|r |S | j||dS )zCompares self to the other operand numerically.
It's pretty much like compare(), but all NaNs signal, with signaling
NaNs taking precedence over quiet NaNs.
Tr rL )r r r r r) r) r+ compare_signalk s
zDecimal.compare_signalc C s` t |dd}| jr |js tS | js,|jr,tS | j}| }| }|sL|r||krt| j| jf}t|j|jf}||k r|rtS tS ||kr|rtS tS tS |r|dkrtS |dkrtS |dkrtS |dkrtS n2|dkrtS |dkrtS |dkrtS |dkrtS | |k rtS | |kr$tS | j|jk r@|rReturn True if self is a qNaN or sNaN; otherwise return False.ra r^ r r) r) r+ r ; s zDecimal.is_nanc C s* | j s
| sdS |dkr t }|j| kS )z?Return True if self is a normal number; otherwise return False.FN)rR r rB r r r) r) r+ is_normal? s
zDecimal.is_normalc C s
| j dkS )z;Return True if self is a quiet NaN; otherwise return False.r9 r^ r r) r) r+ r G s zDecimal.is_qnanc C s
| j dkS )z8Return True if self is negative; otherwise return False.r. )r; r r) r) r+ is_signedK s zDecimal.is_signedc C s
| j dkS )z?Return True if self is a signaling NaN; otherwise return False.r[ r^ r r) r) r+ r O s zDecimal.is_snanc C s* | j s
| sdS |dkr t }| |jk S )z9Return True if self is subnormal; otherwise return False.FN)rR r r rB r r) r) r+ is_subnormalS s
zDecimal.is_subnormalc C s | j o| jdkS )z6Return True if self is a zero; otherwise return False.rS r r r) r) r+ is_zero[ s zDecimal.is_zeroc C s | j t| j d }|dkr4tt|d d d S |dkrXttd| d d d S t| }|j|j }}|dkrt|d| }t|}t|t| ||k S |ttd| | d S )zCompute a lower bound for the adjusted exponent of self.ln().
In other words, compute r such that self.ln() >= 10**r. Assumes
that self is finite and positive and that self != 1.
r. r r r r& rQ rl r< rf ro rW rX r0 r[ rK rL r numZdenr) r) r+
_ln_exp_bound_ s zDecimal._ln_exp_boundc
C s |dkrt }| j|d}|r"|S | s*tS | dkr:tS | tkrFtS | jdkr\|t dS t
| }|j |j }}|j
}|| d }t|||}|ddttt|| d rq|d7 }qtt |d k tt|| }| }|t} ||}| |_|S )
z/Returns the natural (base e) logarithm of self.NrL r. zln of a negative valuer_ r r r] r& )r r _NegativeInfinityr _Infinityr4 rV r; rj r ro rW rX rF rg _dlogrl rf rn r: rI rJ r r rE
r0 r1 r? rK rL r r* rE r rE r) r) r+ lnx s:
$
z
Decimal.lnc C s | j t| j d }|dkr,tt|d S |dkrHttd| d S t| }|j|j }}|dkrt|d| }td| }t|t| ||k d S td| | }t|| |dk d S ) zCompute a lower bound for the adjusted exponent of self.log10().
In other words, find r such that self.log10() >= 10**r.
Assumes that self is finite and positive and that self != 1.
r. r r r& r r_ Z231rd re r) r) r+ r5 s zDecimal._log10_exp_boundc
C sF |dkrt }| j|d}|r"|S | s*tS | dkr:tS | jdkrP|tdS | jd dkr| jdd dt | jd krt
| j t | j d }nt | }|j
|j }}|j}|| d }t|||}|d d
t tt|| d rq|d 7 }qtt
|dk tt|| }| }|t} ||}| |_|S ) z&Returns the base 10 logarithm of self.NrL r. zlog10 of a negative valuer& r rS r_ r r r] )r r rh r ri r; rj r r< rl r rQ ro rW rX rF r5 _dlog10rf rn r: rI rJ r r rE rk r) r) r+ log10 s:
. $
z
Decimal.log10c C sV | j |d}|r|S |dkr"t }| r.tS | s@|tddS t| }||S )aM Returns the exponent of the magnitude of self's MSD.
The result is the integer which is the exponent of the magnitude
of the most significant digit of self (as though it were truncated
to a single digit while maintaining the value of that digit and
without limiting the resulting exponent).
rL Nzlogb(0)r. ) r r r ri rj r
r r r r r) r) r+ logb s z Decimal.logbc C s6 | j dks| jdkrdS | jD ]}|dkr dS q dS )zReturn True if self is a logical operand.
For being logical, it must be a finite number with a sign of 0,
an exponent of 0, and a coefficient whose digits must all be
either 0 or 1.
r& FZ01T)r; rQ r< )r0 digr) r) r+
_islogical
s
zDecimal._islogicalc C s |j t| }|dkr$d| | }n|dk r<||j d }|j t| }|dkr`d| | }n|dk rx||j d }||fS )Nr& rS )rF rl )r0 r1 opaopbZdifr) r) r+
_fill_logical'
s zDecimal._fill_logicalc C sz |dkrt }t|dd}| r*| s4|tS | || j|j\}}ddd t||D }t d|
dptddS ) z;Applies an 'and' operation between self and other's digits.NTr rU c S s$ g | ] \}}t t|t|@ qS r) rf rW .0r2 br) r) r+
B
s z'Decimal.logical_and..r& rS r r rr rj r ru r< rt zipr: rm r0 r r1 rs rt r r) r) r+ logical_and4
s
zDecimal.logical_andc C s( |dkrt }| tdd|j d|S )zInvert all its digits.Nr& r )r logical_xorr: rF r r) r) r+ logical_invertE
s
zDecimal.logical_invertc C sz |dkrt }t|dd}| r*| s4|tS | || j|j\}}ddd t||D }t d|
dptddS ) z:Applies an 'or' operation between self and other's digits.NTr rU c S s$ g | ] \}}t t|t|B qS r) rv rw r) r) r+ rz Z
s z&Decimal.logical_or..r& rS r{ r} r) r) r+
logical_orL
s
zDecimal.logical_orc C sz |dkrt }t|dd}| r*| s4|tS | || j|j\}}ddd t||D }t d|
dptddS ) z;Applies an 'xor' operation between self and other's digits.NTr rU c S s$ g | ] \}}t t|t|A qS r) rv rw r) r) r+ rz k
s z'Decimal.logical_xor..r& rS r{ r} r) r) r+ r ]
s
zDecimal.logical_xorc C s t |dd}|dkrt }| js&|jr~| }| }|s>|r~|dkrX|dkrX| |S |dkrr|dkrr||S | ||S | | }|dkr| |}|dkr|}n| }||S z8Compares the values numerically with their sign ignored.Tr Nr. r& r r r rR r r r r r rP rQ r) r) r+ max_magn
s&
zDecimal.max_magc C s t |dd}|dkrt }| js&|jr~| }| }|s>|r~|dkrX|dkrX| |S |dkrr|dkrr||S | ||S | | }|dkr| |}|dkr| }n|}||S r r rQ r) r) r+ min_mag
s&
zDecimal.min_magc C s |dkrt }| j|d}|r"|S | dkr2tS | dkrTtdd|j | S | }|t |
| |}|| kr|S | tdd|
d |S )z=Returns the largest representable number smaller than itself.NrL r r. r& rD r )r r r rh r: rF r rM rJ r _ignore_all_flagsr r r r0 r1 r? Znew_selfr) r) r+
next_minus
s$
zDecimal.next_minusc C s |dkrt }| j|d}|r"|S | dkr2tS | dkrTtdd|j | S | }|t |
| |}|| kr|S | tdd|
d |S )z=Returns the smallest representable number larger than itself.NrL r. r rD r& r )r r r ri r: rF r rM rJ r r r r r r r) r) r+ next_plus
s$
zDecimal.next_plusc C s t |dd}|dkrt }| ||}|r.|S | |}|dkrJ| |S |dkr^| |}n
| |}| r|t d|j
|t |t nD|
|jk r|t |t |t |t |s|t |S )a Returns the number closest to self, in the direction towards other.
The result is the closest representable number to self
(excluding self) that is in the direction towards other,
unless both have the same value. If the two operands are
numerically equal, then the result is a copy of self with the
sign set to be the same as the sign of other.
Tr Nr& r z Infinite result from next_toward)r r r r rY r r r rj r r; r r r rB r r
r )r0 r r1 r? Z
comparisonr) r) r+ next_toward
s6
zDecimal.next_towardc C s | r dS | rdS | }|dkr,dS |dkr8dS | rN| jrJdS dS |d kr\t }| j|d
rv| jrrd S d S | jrd
S dS d S )a Returns an indication of the class of self.
The class is one of the following strings:
sNaN
NaN
-Infinity
-Normal
-Subnormal
-Zero
+Zero
+Subnormal
+Normal
+Infinity
r r r. z +Infinityr z -Infinityz-Zeroz+ZeroNrL z
-Subnormalz
+Subnormalz-Normalz+Normal)r r r rb r; r ra )r0 r1 infr) r) r+ number_class s, zDecimal.number_classc C s t dS )z'Just returns 10, as this is Decimal, :)r r r r) r) r+ radix0 s z
Decimal.radixc C s |dkrt }t|dd}| ||}|r.|S |jdkrB|tS |j t| kr`|jksln |tS | r|t | S t|}| j
}|jt | }|dkrd| | }n|dk r|| d }||d |d| }t | j
|dpd| jS )z5Returns a rotated copy of self, value-of-other times.NTr r& rS r r r rQ rj r rF rW r r r< rl r: r; rm )r0 r r1 r? torotrotdigtopadZrotatedr) r) r+ rotate4 s0
zDecimal.rotatec C s |dkrt }t|dd}| ||}|r.|S |jdkrB|tS d|j|j }d|j|j }|t| krz|ksn |tS | rt
| S t | j | j
| jt| }||}|S )z>Returns self operand after adding the second value to its exp.NTr r& r r_ )r r r rQ rj r rG rF rW r r r: r; r< r )r0 r r1 r? ZliminfZlimsupr r) r) r+ scalebU s"
zDecimal.scalebc C s |dkrt }t|dd}| ||}|r.|S |jdkrB|tS |j t| kr`|jksln |tS | r|t | S t|}| j
}|jt | }|dkrd| | }n|dk r|| d }|dk r|d| }n |d| }||j d }t | j
|dp
d| jS )z5Returns a shifted copy of self, value-of-other times.NTr r& rS r )r0 r r1 r? r r r Zshiftedr) r) r+ r n s6
z
Decimal.shiftc C s | j t| ffS r( ) __class__rf r r) r) r+
__reduce__ s zDecimal.__reduce__c C s t | tkr| S | t| S r( typer r rf r r) r) r+ __copy__ s zDecimal.__copy__c C s t | tkr| S | t| S r( r )r0 memor) r) r+ __deepcopy__ s zDecimal.__deepcopy__c C sJ |dkrt }t||d}| jrXt| j|}t| }|d dkrL|d7 }t|||S |d dkrvddg|j |d< |d dkrt | j| j
| j d } |j }|d }|dk r|d d kr|
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|} nF|d d kr| | |} n*|d d krt| j
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|} | j t| j
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|S )a| Format a Decimal instance according to the given specifier.
The specifier should be a standard format specifier, with the
form described in PEP 3101. Formatting types 'e', 'E', 'f',
'F', 'g', 'G', 'n' and '%' are supported. If the formatting
type is omitted it defaults to 'g' or 'G', depending on the
value of context.capitals.
N) _localeconvr %gGr_ precisioneEr. zfF%ZgGr& r rS rU )r _parse_format_specifierrR _format_signr; rf r
_format_alignr r: r< rQ rE rF r rl _format_number)r0 Z specifierr1 r specrC bodyrE r r r r| r} rX r) r) r+
__format__ sZ
zDecimal.__format__)rS N)NN)N)N)N)N)N)N)FN)N)N)N)TN)N)N)N)N)N)N)N)N)N)N)N)N)N)N)N)N)NN)N)N)NN)N)NN)NN)N)N)N)N)N)N)N)N)N)N)N)N)N)N)N)N)N)N)N)N)N)N)N)N)N)N)NN)r4 r5 r6 r7 __slots__rd classmethodrw r r r r r r r r r r r r r r r r r r r r r r __radd__r r r __rmul__r r r r r r r r r r r r __trunc__propertyr r r r r= r r r r r r
r r
r dictr r r r r r r3 r= r> rA r rD r rF rH r to_integralrN r r r r r rS rT rP rX r r rY rX r\ r] rC r r_ r r` r ra rb rg rl r5 ro rp rr ru r~ r r r r r r r r r r r r r r r r r r) r) r) r+ r s
,
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2
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V 7 ;! $ K
f > , U n Y = " c * " I K 2 3
. * ! 'Fc C s& t t}| |_||_||_||_|S )zCreate a decimal instance directly, without any validation,
normalization (e.g. removal of leading zeros) or argument
conversion.
This function is for *internal use only*.
)rc rd r r; r< rQ rR )rC Z coefficientr Zspecialr0 r) r) r+ r: s
r: c @ s( e Zd ZdZdd Zdd Zdd ZdS ) rO zContext manager class to support localcontext().
Sets a copy of the supplied context in __enter__() and restores
the previous decimal context in __exit__()
c C s | | _d S r( )rM new_context)r0 r r) r) r+ __init__ s z_ContextManager.__init__c C s t | _t| j | jS r( )r
saved_contextr r r r) r) r+ __enter__ s
z_ContextManager.__enter__c C s t | j d S r( )r r )r0 tvtbr) r) r+ __exit__ s z_ContextManager.__exit__N)r4 r5 r6 r7 r r r r) r) r) r+ rO s rO c @ s e Zd ZdZdddZdd Zdd Zd d
Zd d Zd
d Z dd Z
dd Z dd Z dd Z
dd ZeZdddZdd Zd d Zd d ZdZd!d" Zd#d$ Zd%d& Zdd(d)Zd*d+ Zd,d- Zd.d/ Zd0d1 Z d2d3 Z d4d5 Z d6d7 Z d8d9 Z d:d; Z!dd? Z#d@dA Z$dBdC Z%dDdE Z&dFdG Z'dHdI Z(dJdK Z)dLdM Z*dNdO Z+dPdQ Z,dRdS Z-dTdU Z.dVdW Z/dXdY Z0dZd[ Z1d\d] Z2d^d_ Z3d`da Z4dbdc Z5ddde Z6dfdg Z7dhdi Z8djdk Z9dldm Z:dndo Z;dpdq Zdvdw Z?dxdy Z@dzd{ ZAd|d} ZBd~d ZCdd ZDdd ZEdd ZFdd ZGdddZHdd ZIdd ZJdd ZKdd ZLdd ZMdd ZNdd ZOdd ZPdd ZQdd ZRdd ZSdd ZTdd ZUdd ZVeVZWdS )r a Contains the context for a Decimal instance.
Contains:
prec - precision (for use in rounding, division, square roots..)
rounding - rounding type (how you round)
traps - If traps[exception] = 1, then the exception is
raised when it is caused. Otherwise, a value is
substituted in.
flags - When an exception is caused, flags[exception] is set.
(Whether or not the trap_enabler is set)
Should be reset by user of Decimal instance.
Emin - Minimum exponent
Emax - Maximum exponent
capitals - If 1, 1*10^1 is printed as 1E+1.
If 0, printed as 1e1
clamp - If 1, change exponents if too high (Default 0)
Nc
s> zt }
W n tk
r Y nX |d k r*|n|
j| _|d k r>|n|
j| _|d k rR|n|
j| _|d k rf|n|
j| _|d k rz|n|
j| _|d k r|n|
j| _| d krg | _n| | _d kr|
j
| _ n.t t st fddt
D | _ n| _ d kr
t t
d| _n0t t s4t fddt
D | _n | _d S )Nc 3 s | ]}|t | kfV qd S r( rW rx r r8 r) r+ I s z#Context.__init__..r& c 3 s | ]}|t | kfV qd S r( r r r9 r) r+ r P s )r NameErrorrF rE rB rG r r _ignored_flagsr8 rM re r r7 fromkeysr9 ) r0 rF rE rB rG r r r9 r8 r Zdcr) )r9 r8 r+ r 0 s.
zContext.__init__c C s t |tstd| |dkr<||krtd||||f nJ|dkrb||k rtd||||f n$||k sr||krtd||||f t| ||S )Nz%s must be an integer-infz %s must be in [%s, %d]. got: %sr z %s must be in [%d, %s]. got: %sz %s must be in [%d, %d]. got %s)re rW rx rr rc __setattr__)r0 namerz ZvminZvmaxr) r) r+ _set_integer_checkT s
zContext._set_integer_checkc C s` t |tstd| |D ]}|tkrtd| qtD ]}||kr8td| q8t| ||S )Nz%s must be a signal dictz %s is not a valid signal dict)re r rx r7 KeyErrorrc r )r0 r r keyr) r) r+ _set_signal_dictb s
zContext._set_signal_dictc C s |dkr| ||ddS |dkr0| ||ddS |dkrH| ||ddS |dkr`| ||ddS |d krx| ||ddS |d
kr|tkrtd | t| ||S |d ks|d
kr| ||S |dkrt| ||S td| d S )NrF r. r rB r r& rG r r rE z%s: invalid rounding moder9 r8 r z.'decimal.Context' object has no attribute '%s')r _rounding_modesrx rc r r AttributeError)r0 r rz r) r) r+ r m s* zContext.__setattr__c C s t d| d S )Nz%s cannot be deleted)r )r0 r r) r) r+ __delattr__ s zContext.__delattr__c C sN dd | j D }dd | j D }| j| j| j| j| j| j| j ||ffS )Nc S s g | ]\}}|r|qS r) r) rx sigr r) r) r+ rz s z&Context.__reduce__..c S s g | ]\}}|r|qS r) r) r r) r) r+ rz s )
r9 itemsr8 r rF rE rB rG r r )r0 r9 r8 r) r) r+ r s zContext.__reduce__c C s| g }| dt| dd | j D }| dd| d dd | j D }| dd| d d|d S )
zShow the current context.zrContext(prec=%(prec)d, rounding=%(rounding)s, Emin=%(Emin)d, Emax=%(Emax)d, capitals=%(capitals)d, clamp=%(clamp)dc S s g | ]\}}|r|j qS r) r4 )rx r r r) r) r+ rz s z$Context.__repr__..zflags=[z, ]c S s g | ]\}}|r|j qS r) r )rx r r r) r) r+ rz s ztraps=[))rs varsr9 r rt r8 )r0 r namesr) r) r+ r s zContext.__repr__c C s | j D ]}d| j |< qdS )zReset all flags to zeror& Nr r0 flagr) r) r+ rN s
zContext.clear_flagsc C s | j D ]}d| j |< qdS )zReset all traps to zeror& Nr r r) r) r+ clear_traps s
zContext.clear_trapsc
C s. t | j| j| j| j| j| j| j| j| j }|S )z!Returns a shallow copy from self.)
r rF rE rB rG r r r9 r8 r r0 Zncr) r) r+ rI s zContext._shallow_copyc
C s6 t | j| j| j| j| j| j| j | j | j
}|S )z Returns a deep copy from self.) r rF rE rB rG r r r9 rM r8 r r r) r) r+ rM s z Context.copyc G sZ t ||}|| jkr(| j| f| S d| j|< | j| sN| j| f| S ||dS )a# Handles an error
If the flag is in _ignored_flags, returns the default response.
Otherwise, it sets the flag, then, if the corresponding
trap_enabler is set, it reraises the exception. Otherwise, it returns
the default value after setting the flag.
r. N)_condition_maprI r r2 r9 r8 )r0 Z conditionZ explanationr* errorr) r) r+ rj s
zContext._raise_errorc C s
| j t S )z$Ignore all flags, if they are raised)
_ignore_flagsr7 r r) r) r+ r s zContext._ignore_all_flagsc G s | j t| | _ t|S )z$Ignore the flags, if they are raised)r rp )r0 r9 r) r) r+ r s zContext._ignore_flagsc G s8 |r t |d ttfr |d }|D ]}| j| q"dS )z+Stop ignoring the flags, if they are raisedr& N)re rq rp r remove)r0 r9 r r) r) r+
_regard_flags s zContext._regard_flagsc C s t | j| j d S )z!Returns Etiny (= Emin - prec + 1)r. )rW rB rF r r) r) r+ r s z
Context.Etinyc C s t | j| j d S )z,Returns maximum exponent (= Emax - prec + 1)r. )rW rG rF r r) r) r+ r s z Context.Etopc C s | j }|| _ |S )a Sets the rounding type.
Sets the rounding type, and returns the current (previous)
rounding type. Often used like:
context = context.copy()
# so you don't change the calling context
# if an error occurs in the middle.
rounding = context._set_rounding(ROUND_UP)
val = self.__sub__(other, context=context)
context._set_rounding(rounding)
This will make it round up for that operation.
)rE )r0 r rE r) r) r+ rJ s zContext._set_roundingrS c C sj t |tr*|| ks d|kr*| tdS t|| d}| r`t|j| j | j
kr`| tdS | | S )zCreates a new Decimal instance but using self as context.
This method implements the to-number operation of the
IBM Decimal specification.rT zAtrailing or leading whitespace and underscores are not permitted.rL z diagnostic info too long in NaN) re rf rh rj r r r rl r< rF r r )r0 rf r r) r) r+ create_decimal s zContext.create_decimalc C s t |}|| S )a Creates a new Decimal instance from a float but rounding using self
as the context.
>>> context = Context(prec=5, rounding=ROUND_DOWN)
>>> context.create_decimal_from_float(3.1415926535897932)
Decimal('3.1415')
>>> context = Context(prec=5, traps=[Inexact])
>>> context.create_decimal_from_float(3.1415926535897932)
Traceback (most recent call last):
...
decimal.Inexact: None
)r rw r )r0 r r r) r) r+ create_decimal_from_float s
z!Context.create_decimal_from_floatc C s t |dd}|j| dS )a[ Returns the absolute value of the operand.
If the operand is negative, the result is the same as using the minus
operation on the operand. Otherwise, the result is the same as using
the plus operation on the operand.
>>> ExtendedContext.abs(Decimal('2.1'))
Decimal('2.1')
>>> ExtendedContext.abs(Decimal('-100'))
Decimal('100')
>>> ExtendedContext.abs(Decimal('101.5'))
Decimal('101.5')
>>> ExtendedContext.abs(Decimal('-101.5'))
Decimal('101.5')
>>> ExtendedContext.abs(-1)
Decimal('1')
Tr rL )r r r0 r2 r) r) r+ rn ! s z Context.absc C s8 t |dd}|j|| d}|tkr0td| n|S dS )a Return the sum of the two operands.
>>> ExtendedContext.add(Decimal('12'), Decimal('7.00'))
Decimal('19.00')
>>> ExtendedContext.add(Decimal('1E+2'), Decimal('1.01E+4'))
Decimal('1.02E+4')
>>> ExtendedContext.add(1, Decimal(2))
Decimal('3')
>>> ExtendedContext.add(Decimal(8), 5)
Decimal('13')
>>> ExtendedContext.add(5, 5)
Decimal('10')
Tr rL Unable to convert %s to DecimalN)r r r rx r0 r2 ry r r) r) r+ add6 s
z Context.addc C s t || S r( )rf r r r) r) r+ _applyK s zContext._applyc C s t |tstd| S )zReturns the same Decimal object.
As we do not have different encodings for the same number, the
received object already is in its canonical form.
>>> ExtendedContext.canonical(Decimal('2.50'))
Decimal('2.50')
z,canonical requires a Decimal as an argument.)re r rx rS r r) r) r+ rS N s
zContext.canonicalc C s t |dd}|j|| dS )a Compares values numerically.
If the signs of the operands differ, a value representing each operand
('-1' if the operand is less than zero, '0' if the operand is zero or
negative zero, or '1' if the operand is greater than zero) is used in
place of that operand for the comparison instead of the actual
operand.
The comparison is then effected by subtracting the second operand from
the first and then returning a value according to the result of the
subtraction: '-1' if the result is less than zero, '0' if the result is
zero or negative zero, or '1' if the result is greater than zero.
>>> ExtendedContext.compare(Decimal('2.1'), Decimal('3'))
Decimal('-1')
>>> ExtendedContext.compare(Decimal('2.1'), Decimal('2.1'))
Decimal('0')
>>> ExtendedContext.compare(Decimal('2.1'), Decimal('2.10'))
Decimal('0')
>>> ExtendedContext.compare(Decimal('3'), Decimal('2.1'))
Decimal('1')
>>> ExtendedContext.compare(Decimal('2.1'), Decimal('-3'))
Decimal('1')
>>> ExtendedContext.compare(Decimal('-3'), Decimal('2.1'))
Decimal('-1')
>>> ExtendedContext.compare(1, 2)
Decimal('-1')
>>> ExtendedContext.compare(Decimal(1), 2)
Decimal('-1')
>>> ExtendedContext.compare(1, Decimal(2))
Decimal('-1')
Tr rL )r r r0 r2 ry r) r) r+ r [ s ! zContext.comparec C s t |dd}|j|| dS )a Compares the values of the two operands numerically.
It's pretty much like compare(), but all NaNs signal, with signaling
NaNs taking precedence over quiet NaNs.
>>> c = ExtendedContext
>>> c.compare_signal(Decimal('2.1'), Decimal('3'))
Decimal('-1')
>>> c.compare_signal(Decimal('2.1'), Decimal('2.1'))
Decimal('0')
>>> c.flags[InvalidOperation] = 0
>>> print(c.flags[InvalidOperation])
0
>>> c.compare_signal(Decimal('NaN'), Decimal('2.1'))
Decimal('NaN')
>>> print(c.flags[InvalidOperation])
1
>>> c.flags[InvalidOperation] = 0
>>> print(c.flags[InvalidOperation])
0
>>> c.compare_signal(Decimal('sNaN'), Decimal('2.1'))
Decimal('NaN')
>>> print(c.flags[InvalidOperation])
1
>>> c.compare_signal(-1, 2)
Decimal('-1')
>>> c.compare_signal(Decimal(-1), 2)
Decimal('-1')
>>> c.compare_signal(-1, Decimal(2))
Decimal('-1')
Tr rL )r rT r r) r) r+ rT s zContext.compare_signalc C s t |dd}||S )a+ Compares two operands using their abstract representation.
This is not like the standard compare, which use their numerical
value. Note that a total ordering is defined for all possible abstract
representations.
>>> ExtendedContext.compare_total(Decimal('12.73'), Decimal('127.9'))
Decimal('-1')
>>> ExtendedContext.compare_total(Decimal('-127'), Decimal('12'))
Decimal('-1')
>>> ExtendedContext.compare_total(Decimal('12.30'), Decimal('12.3'))
Decimal('-1')
>>> ExtendedContext.compare_total(Decimal('12.30'), Decimal('12.30'))
Decimal('0')
>>> ExtendedContext.compare_total(Decimal('12.3'), Decimal('12.300'))
Decimal('1')
>>> ExtendedContext.compare_total(Decimal('12.3'), Decimal('NaN'))
Decimal('-1')
>>> ExtendedContext.compare_total(1, 2)
Decimal('-1')
>>> ExtendedContext.compare_total(Decimal(1), 2)
Decimal('-1')
>>> ExtendedContext.compare_total(1, Decimal(2))
Decimal('-1')
Tr )r rP r r) r) r+ rP s zContext.compare_totalc C s t |dd}||S )zCompares two operands using their abstract representation ignoring sign.
Like compare_total, but with operand's sign ignored and assumed to be 0.
Tr )r rX r r) r) r+ rX s zContext.compare_total_magc C s t |dd}| S )a Returns a copy of the operand with the sign set to 0.
>>> ExtendedContext.copy_abs(Decimal('2.1'))
Decimal('2.1')
>>> ExtendedContext.copy_abs(Decimal('-100'))
Decimal('100')
>>> ExtendedContext.copy_abs(-1)
Decimal('1')
Tr )r r r r) r) r+ r s
zContext.copy_absc C s t |dd}t|S )a Returns a copy of the decimal object.
>>> ExtendedContext.copy_decimal(Decimal('2.1'))
Decimal('2.1')
>>> ExtendedContext.copy_decimal(Decimal('-1.00'))
Decimal('-1.00')
>>> ExtendedContext.copy_decimal(1)
Decimal('1')
Tr )r r r r) r) r+ copy_decimal s
zContext.copy_decimalc C s t |dd}| S )a( Returns a copy of the operand with the sign inverted.
>>> ExtendedContext.copy_negate(Decimal('101.5'))
Decimal('-101.5')
>>> ExtendedContext.copy_negate(Decimal('-101.5'))
Decimal('101.5')
>>> ExtendedContext.copy_negate(1)
Decimal('-1')
Tr )r r r r) r) r+ r s
zContext.copy_negatec C s t |dd}||S )a Copies the second operand's sign to the first one.
In detail, it returns a copy of the first operand with the sign
equal to the sign of the second operand.
>>> ExtendedContext.copy_sign(Decimal( '1.50'), Decimal('7.33'))
Decimal('1.50')
>>> ExtendedContext.copy_sign(Decimal('-1.50'), Decimal('7.33'))
Decimal('1.50')
>>> ExtendedContext.copy_sign(Decimal( '1.50'), Decimal('-7.33'))
Decimal('-1.50')
>>> ExtendedContext.copy_sign(Decimal('-1.50'), Decimal('-7.33'))
Decimal('-1.50')
>>> ExtendedContext.copy_sign(1, -2)
Decimal('-1')
>>> ExtendedContext.copy_sign(Decimal(1), -2)
Decimal('-1')
>>> ExtendedContext.copy_sign(1, Decimal(-2))
Decimal('-1')
Tr )r rY r r) r) r+ rY s zContext.copy_signc C s8 t |dd}|j|| d}|tkr0td| n|S dS )a Decimal division in a specified context.
>>> ExtendedContext.divide(Decimal('1'), Decimal('3'))
Decimal('0.333333333')
>>> ExtendedContext.divide(Decimal('2'), Decimal('3'))
Decimal('0.666666667')
>>> ExtendedContext.divide(Decimal('5'), Decimal('2'))
Decimal('2.5')
>>> ExtendedContext.divide(Decimal('1'), Decimal('10'))
Decimal('0.1')
>>> ExtendedContext.divide(Decimal('12'), Decimal('12'))
Decimal('1')
>>> ExtendedContext.divide(Decimal('8.00'), Decimal('2'))
Decimal('4.00')
>>> ExtendedContext.divide(Decimal('2.400'), Decimal('2.0'))
Decimal('1.20')
>>> ExtendedContext.divide(Decimal('1000'), Decimal('100'))
Decimal('10')
>>> ExtendedContext.divide(Decimal('1000'), Decimal('1'))
Decimal('1000')
>>> ExtendedContext.divide(Decimal('2.40E+6'), Decimal('2'))
Decimal('1.20E+6')
>>> ExtendedContext.divide(5, 5)
Decimal('1')
>>> ExtendedContext.divide(Decimal(5), 5)
Decimal('1')
>>> ExtendedContext.divide(5, Decimal(5))
Decimal('1')
Tr rL r N)r r r rx r r) r) r+ divide s
zContext.dividec C s8 t |dd}|j|| d}|tkr0td| n|S dS )a/ Divides two numbers and returns the integer part of the result.
>>> ExtendedContext.divide_int(Decimal('2'), Decimal('3'))
Decimal('0')
>>> ExtendedContext.divide_int(Decimal('10'), Decimal('3'))
Decimal('3')
>>> ExtendedContext.divide_int(Decimal('1'), Decimal('0.3'))
Decimal('3')
>>> ExtendedContext.divide_int(10, 3)
Decimal('3')
>>> ExtendedContext.divide_int(Decimal(10), 3)
Decimal('3')
>>> ExtendedContext.divide_int(10, Decimal(3))
Decimal('3')
Tr rL r N)r r r rx r r) r) r+
divide_int+ s
zContext.divide_intc C s8 t |dd}|j|| d}|tkr0td| n|S dS )a Return (a // b, a % b).
>>> ExtendedContext.divmod(Decimal(8), Decimal(3))
(Decimal('2'), Decimal('2'))
>>> ExtendedContext.divmod(Decimal(8), Decimal(4))
(Decimal('2'), Decimal('0'))
>>> ExtendedContext.divmod(8, 4)
(Decimal('2'), Decimal('0'))
>>> ExtendedContext.divmod(Decimal(8), 4)
(Decimal('2'), Decimal('0'))
>>> ExtendedContext.divmod(8, Decimal(4))
(Decimal('2'), Decimal('0'))
Tr rL r N)r r r rx r r) r) r+ r B s
zContext.divmodc C s t |dd}|j| dS )a# Returns e ** a.
>>> c = ExtendedContext.copy()
>>> c.Emin = -999
>>> c.Emax = 999
>>> c.exp(Decimal('-Infinity'))
Decimal('0')
>>> c.exp(Decimal('-1'))
Decimal('0.367879441')
>>> c.exp(Decimal('0'))
Decimal('1')
>>> c.exp(Decimal('1'))
Decimal('2.71828183')
>>> c.exp(Decimal('0.693147181'))
Decimal('2.00000000')
>>> c.exp(Decimal('+Infinity'))
Decimal('Infinity')
>>> c.exp(10)
Decimal('22026.4658')
Tr rL )r rX r r) r) r+ rX W s z Context.expc C s t |dd}|j||| dS )a Returns a multiplied by b, plus c.
The first two operands are multiplied together, using multiply,
the third operand is then added to the result of that
multiplication, using add, all with only one final rounding.
>>> ExtendedContext.fma(Decimal('3'), Decimal('5'), Decimal('7'))
Decimal('22')
>>> ExtendedContext.fma(Decimal('3'), Decimal('-5'), Decimal('7'))
Decimal('-8')
>>> ExtendedContext.fma(Decimal('888565290'), Decimal('1557.96930'), Decimal('-86087.7578'))
Decimal('1.38435736E+12')
>>> ExtendedContext.fma(1, 3, 4)
Decimal('7')
>>> ExtendedContext.fma(1, Decimal(3), 4)
Decimal('7')
>>> ExtendedContext.fma(1, 3, Decimal(4))
Decimal('7')
Tr rL )r r )r0 r2 ry rL r) r) r+ r o s z Context.fmac C s t |tstd| S )a Return True if the operand is canonical; otherwise return False.
Currently, the encoding of a Decimal instance is always
canonical, so this method returns True for any Decimal.
>>> ExtendedContext.is_canonical(Decimal('2.50'))
True
z/is_canonical requires a Decimal as an argument.)re r rx r\ r r) r) r+ r\ s
zContext.is_canonicalc C s t |dd}| S )a, Return True if the operand is finite; otherwise return False.
A Decimal instance is considered finite if it is neither
infinite nor a NaN.
>>> ExtendedContext.is_finite(Decimal('2.50'))
True
>>> ExtendedContext.is_finite(Decimal('-0.3'))
True
>>> ExtendedContext.is_finite(Decimal('0'))
True
>>> ExtendedContext.is_finite(Decimal('Inf'))
False
>>> ExtendedContext.is_finite(Decimal('NaN'))
False
>>> ExtendedContext.is_finite(1)
True
Tr )r r] r r) r) r+ r] s zContext.is_finitec C s t |dd}| S )aU Return True if the operand is infinite; otherwise return False.
>>> ExtendedContext.is_infinite(Decimal('2.50'))
False
>>> ExtendedContext.is_infinite(Decimal('-Inf'))
True
>>> ExtendedContext.is_infinite(Decimal('NaN'))
False
>>> ExtendedContext.is_infinite(1)
False
Tr )r rC r r) r) r+ rC s zContext.is_infinitec C s t |dd}| S )aO Return True if the operand is a qNaN or sNaN;
otherwise return False.
>>> ExtendedContext.is_nan(Decimal('2.50'))
False
>>> ExtendedContext.is_nan(Decimal('NaN'))
True
>>> ExtendedContext.is_nan(Decimal('-sNaN'))
True
>>> ExtendedContext.is_nan(1)
False
Tr )r r r r) r) r+ r s
zContext.is_nanc C s t |dd}|j| dS )a Return True if the operand is a normal number;
otherwise return False.
>>> c = ExtendedContext.copy()
>>> c.Emin = -999
>>> c.Emax = 999
>>> c.is_normal(Decimal('2.50'))
True
>>> c.is_normal(Decimal('0.1E-999'))
False
>>> c.is_normal(Decimal('0.00'))
False
>>> c.is_normal(Decimal('-Inf'))
False
>>> c.is_normal(Decimal('NaN'))
False
>>> c.is_normal(1)
True
Tr rL )r r_ r r) r) r+ r_ s zContext.is_normalc C s t |dd}| S )aH Return True if the operand is a quiet NaN; otherwise return False.
>>> ExtendedContext.is_qnan(Decimal('2.50'))
False
>>> ExtendedContext.is_qnan(Decimal('NaN'))
True
>>> ExtendedContext.is_qnan(Decimal('sNaN'))
False
>>> ExtendedContext.is_qnan(1)
False
Tr )r r r r) r) r+ r s zContext.is_qnanc C s t |dd}| S )a Return True if the operand is negative; otherwise return False.
>>> ExtendedContext.is_signed(Decimal('2.50'))
False
>>> ExtendedContext.is_signed(Decimal('-12'))
True
>>> ExtendedContext.is_signed(Decimal('-0'))
True
>>> ExtendedContext.is_signed(8)
False
>>> ExtendedContext.is_signed(-8)
True
Tr )r r` r r) r) r+ r` s zContext.is_signedc C s t |dd}| S )aT Return True if the operand is a signaling NaN;
otherwise return False.
>>> ExtendedContext.is_snan(Decimal('2.50'))
False
>>> ExtendedContext.is_snan(Decimal('NaN'))
False
>>> ExtendedContext.is_snan(Decimal('sNaN'))
True
>>> ExtendedContext.is_snan(1)
False
Tr )r r r r) r) r+ r s
zContext.is_snanc C s t |dd}|j| dS )a Return True if the operand is subnormal; otherwise return False.
>>> c = ExtendedContext.copy()
>>> c.Emin = -999
>>> c.Emax = 999
>>> c.is_subnormal(Decimal('2.50'))
False
>>> c.is_subnormal(Decimal('0.1E-999'))
True
>>> c.is_subnormal(Decimal('0.00'))
False
>>> c.is_subnormal(Decimal('-Inf'))
False
>>> c.is_subnormal(Decimal('NaN'))
False
>>> c.is_subnormal(1)
False
Tr rL )r ra r r) r) r+ ra s zContext.is_subnormalc C s t |dd}| S )au Return True if the operand is a zero; otherwise return False.
>>> ExtendedContext.is_zero(Decimal('0'))
True
>>> ExtendedContext.is_zero(Decimal('2.50'))
False
>>> ExtendedContext.is_zero(Decimal('-0E+2'))
True
>>> ExtendedContext.is_zero(1)
False
>>> ExtendedContext.is_zero(0)
True
Tr )r rb r r) r) r+ rb % s zContext.is_zeroc C s t |dd}|j| dS )a Returns the natural (base e) logarithm of the operand.
>>> c = ExtendedContext.copy()
>>> c.Emin = -999
>>> c.Emax = 999
>>> c.ln(Decimal('0'))
Decimal('-Infinity')
>>> c.ln(Decimal('1.000'))
Decimal('0')
>>> c.ln(Decimal('2.71828183'))
Decimal('1.00000000')
>>> c.ln(Decimal('10'))
Decimal('2.30258509')
>>> c.ln(Decimal('+Infinity'))
Decimal('Infinity')
>>> c.ln(1)
Decimal('0')
Tr rL )r rl r r) r) r+ rl 6 s z
Context.lnc C s t |dd}|j| dS )a Returns the base 10 logarithm of the operand.
>>> c = ExtendedContext.copy()
>>> c.Emin = -999
>>> c.Emax = 999
>>> c.log10(Decimal('0'))
Decimal('-Infinity')
>>> c.log10(Decimal('0.001'))
Decimal('-3')
>>> c.log10(Decimal('1.000'))
Decimal('0')
>>> c.log10(Decimal('2'))
Decimal('0.301029996')
>>> c.log10(Decimal('10'))
Decimal('1')
>>> c.log10(Decimal('70'))
Decimal('1.84509804')
>>> c.log10(Decimal('+Infinity'))
Decimal('Infinity')
>>> c.log10(0)
Decimal('-Infinity')
>>> c.log10(1)
Decimal('0')
Tr rL )r ro r r) r) r+ ro L s z
Context.log10c C s t |dd}|j| dS )a4 Returns the exponent of the magnitude of the operand's MSD.
The result is the integer which is the exponent of the magnitude
of the most significant digit of the operand (as though the
operand were truncated to a single digit while maintaining the
value of that digit and without limiting the resulting exponent).
>>> ExtendedContext.logb(Decimal('250'))
Decimal('2')
>>> ExtendedContext.logb(Decimal('2.50'))
Decimal('0')
>>> ExtendedContext.logb(Decimal('0.03'))
Decimal('-2')
>>> ExtendedContext.logb(Decimal('0'))
Decimal('-Infinity')
>>> ExtendedContext.logb(1)
Decimal('0')
>>> ExtendedContext.logb(10)
Decimal('1')
>>> ExtendedContext.logb(100)
Decimal('2')
Tr rL )r rp r r) r) r+ rp h s z Context.logbc C s t |dd}|j|| dS )a Applies the logical operation 'and' between each operand's digits.
The operands must be both logical numbers.
>>> ExtendedContext.logical_and(Decimal('0'), Decimal('0'))
Decimal('0')
>>> ExtendedContext.logical_and(Decimal('0'), Decimal('1'))
Decimal('0')
>>> ExtendedContext.logical_and(Decimal('1'), Decimal('0'))
Decimal('0')
>>> ExtendedContext.logical_and(Decimal('1'), Decimal('1'))
Decimal('1')
>>> ExtendedContext.logical_and(Decimal('1100'), Decimal('1010'))
Decimal('1000')
>>> ExtendedContext.logical_and(Decimal('1111'), Decimal('10'))
Decimal('10')
>>> ExtendedContext.logical_and(110, 1101)
Decimal('100')
>>> ExtendedContext.logical_and(Decimal(110), 1101)
Decimal('100')
>>> ExtendedContext.logical_and(110, Decimal(1101))
Decimal('100')
Tr rL )r r~ r r) r) r+ r~ s zContext.logical_andc C s t |dd}|j| dS )a Invert all the digits in the operand.
The operand must be a logical number.
>>> ExtendedContext.logical_invert(Decimal('0'))
Decimal('111111111')
>>> ExtendedContext.logical_invert(Decimal('1'))
Decimal('111111110')
>>> ExtendedContext.logical_invert(Decimal('111111111'))
Decimal('0')
>>> ExtendedContext.logical_invert(Decimal('101010101'))
Decimal('10101010')
>>> ExtendedContext.logical_invert(1101)
Decimal('111110010')
Tr rL )r r r r) r) r+ r s zContext.logical_invertc C s t |dd}|j|| dS )a Applies the logical operation 'or' between each operand's digits.
The operands must be both logical numbers.
>>> ExtendedContext.logical_or(Decimal('0'), Decimal('0'))
Decimal('0')
>>> ExtendedContext.logical_or(Decimal('0'), Decimal('1'))
Decimal('1')
>>> ExtendedContext.logical_or(Decimal('1'), Decimal('0'))
Decimal('1')
>>> ExtendedContext.logical_or(Decimal('1'), Decimal('1'))
Decimal('1')
>>> ExtendedContext.logical_or(Decimal('1100'), Decimal('1010'))
Decimal('1110')
>>> ExtendedContext.logical_or(Decimal('1110'), Decimal('10'))
Decimal('1110')
>>> ExtendedContext.logical_or(110, 1101)
Decimal('1111')
>>> ExtendedContext.logical_or(Decimal(110), 1101)
Decimal('1111')
>>> ExtendedContext.logical_or(110, Decimal(1101))
Decimal('1111')
Tr rL )r r r r) r) r+ r s zContext.logical_orc C s t |dd}|j|| dS )a Applies the logical operation 'xor' between each operand's digits.
The operands must be both logical numbers.
>>> ExtendedContext.logical_xor(Decimal('0'), Decimal('0'))
Decimal('0')
>>> ExtendedContext.logical_xor(Decimal('0'), Decimal('1'))
Decimal('1')
>>> ExtendedContext.logical_xor(Decimal('1'), Decimal('0'))
Decimal('1')
>>> ExtendedContext.logical_xor(Decimal('1'), Decimal('1'))
Decimal('0')
>>> ExtendedContext.logical_xor(Decimal('1100'), Decimal('1010'))
Decimal('110')
>>> ExtendedContext.logical_xor(Decimal('1111'), Decimal('10'))
Decimal('1101')
>>> ExtendedContext.logical_xor(110, 1101)
Decimal('1011')
>>> ExtendedContext.logical_xor(Decimal(110), 1101)
Decimal('1011')
>>> ExtendedContext.logical_xor(110, Decimal(1101))
Decimal('1011')
Tr rL )r r r r) r) r+ r s zContext.logical_xorc C s t |dd}|j|| dS )a max compares two values numerically and returns the maximum.
If either operand is a NaN then the general rules apply.
Otherwise, the operands are compared as though by the compare
operation. If they are numerically equal then the left-hand operand
is chosen as the result. Otherwise the maximum (closer to positive
infinity) of the two operands is chosen as the result.
>>> ExtendedContext.max(Decimal('3'), Decimal('2'))
Decimal('3')
>>> ExtendedContext.max(Decimal('-10'), Decimal('3'))
Decimal('3')
>>> ExtendedContext.max(Decimal('1.0'), Decimal('1'))
Decimal('1')
>>> ExtendedContext.max(Decimal('7'), Decimal('NaN'))
Decimal('7')
>>> ExtendedContext.max(1, 2)
Decimal('2')
>>> ExtendedContext.max(Decimal(1), 2)
Decimal('2')
>>> ExtendedContext.max(1, Decimal(2))
Decimal('2')
Tr rL )r r r r) r) r+ r s z Context.maxc C s t |dd}|j|| dS )a Compares the values numerically with their sign ignored.
>>> ExtendedContext.max_mag(Decimal('7'), Decimal('NaN'))
Decimal('7')
>>> ExtendedContext.max_mag(Decimal('7'), Decimal('-10'))
Decimal('-10')
>>> ExtendedContext.max_mag(1, -2)
Decimal('-2')
>>> ExtendedContext.max_mag(Decimal(1), -2)
Decimal('-2')
>>> ExtendedContext.max_mag(1, Decimal(-2))
Decimal('-2')
Tr rL )r r r r) r) r+ r s zContext.max_magc C s t |dd}|j|| dS )a min compares two values numerically and returns the minimum.
If either operand is a NaN then the general rules apply.
Otherwise, the operands are compared as though by the compare
operation. If they are numerically equal then the left-hand operand
is chosen as the result. Otherwise the minimum (closer to negative
infinity) of the two operands is chosen as the result.
>>> ExtendedContext.min(Decimal('3'), Decimal('2'))
Decimal('2')
>>> ExtendedContext.min(Decimal('-10'), Decimal('3'))
Decimal('-10')
>>> ExtendedContext.min(Decimal('1.0'), Decimal('1'))
Decimal('1.0')
>>> ExtendedContext.min(Decimal('7'), Decimal('NaN'))
Decimal('7')
>>> ExtendedContext.min(1, 2)
Decimal('1')
>>> ExtendedContext.min(Decimal(1), 2)
Decimal('1')
>>> ExtendedContext.min(1, Decimal(29))
Decimal('1')
Tr rL )r r r r) r) r+ r s z Context.minc C s t |dd}|j|| dS )a Compares the values numerically with their sign ignored.
>>> ExtendedContext.min_mag(Decimal('3'), Decimal('-2'))
Decimal('-2')
>>> ExtendedContext.min_mag(Decimal('-3'), Decimal('NaN'))
Decimal('-3')
>>> ExtendedContext.min_mag(1, -2)
Decimal('1')
>>> ExtendedContext.min_mag(Decimal(1), -2)
Decimal('1')
>>> ExtendedContext.min_mag(1, Decimal(-2))
Decimal('1')
Tr rL )r r r r) r) r+ r - s zContext.min_magc C s t |dd}|j| dS )a Minus corresponds to unary prefix minus in Python.
The operation is evaluated using the same rules as subtract; the
operation minus(a) is calculated as subtract('0', a) where the '0'
has the same exponent as the operand.
>>> ExtendedContext.minus(Decimal('1.3'))
Decimal('-1.3')
>>> ExtendedContext.minus(Decimal('-1.3'))
Decimal('1.3')
>>> ExtendedContext.minus(1)
Decimal('-1')
Tr rL )r r r r) r) r+ minus> s z
Context.minusc C s8 t |dd}|j|| d}|tkr0td| n|S dS )a multiply multiplies two operands.
If either operand is a special value then the general rules apply.
Otherwise, the operands are multiplied together
('long multiplication'), resulting in a number which may be as long as
the sum of the lengths of the two operands.
>>> ExtendedContext.multiply(Decimal('1.20'), Decimal('3'))
Decimal('3.60')
>>> ExtendedContext.multiply(Decimal('7'), Decimal('3'))
Decimal('21')
>>> ExtendedContext.multiply(Decimal('0.9'), Decimal('0.8'))
Decimal('0.72')
>>> ExtendedContext.multiply(Decimal('0.9'), Decimal('-0'))
Decimal('-0.0')
>>> ExtendedContext.multiply(Decimal('654321'), Decimal('654321'))
Decimal('4.28135971E+11')
>>> ExtendedContext.multiply(7, 7)
Decimal('49')
>>> ExtendedContext.multiply(Decimal(7), 7)
Decimal('49')
>>> ExtendedContext.multiply(7, Decimal(7))
Decimal('49')
Tr rL r N)r r r rx r r) r) r+ multiplyO s
zContext.multiplyc C s t |dd}|j| dS )a" Returns the largest representable number smaller than a.
>>> c = ExtendedContext.copy()
>>> c.Emin = -999
>>> c.Emax = 999
>>> ExtendedContext.next_minus(Decimal('1'))
Decimal('0.999999999')
>>> c.next_minus(Decimal('1E-1007'))
Decimal('0E-1007')
>>> ExtendedContext.next_minus(Decimal('-1.00000003'))
Decimal('-1.00000004')
>>> c.next_minus(Decimal('Infinity'))
Decimal('9.99999999E+999')
>>> c.next_minus(1)
Decimal('0.999999999')
Tr rL )r r r r) r) r+ r o s zContext.next_minusc C s t |dd}|j| dS )a Returns the smallest representable number larger than a.
>>> c = ExtendedContext.copy()
>>> c.Emin = -999
>>> c.Emax = 999
>>> ExtendedContext.next_plus(Decimal('1'))
Decimal('1.00000001')
>>> c.next_plus(Decimal('-1E-1007'))
Decimal('-0E-1007')
>>> ExtendedContext.next_plus(Decimal('-1.00000003'))
Decimal('-1.00000002')
>>> c.next_plus(Decimal('-Infinity'))
Decimal('-9.99999999E+999')
>>> c.next_plus(1)
Decimal('1.00000001')
Tr rL )r r r r) r) r+ r s zContext.next_plusc C s t |dd}|j|| dS )a Returns the number closest to a, in direction towards b.
The result is the closest representable number from the first
operand (but not the first operand) that is in the direction
towards the second operand, unless the operands have the same
value.
>>> c = ExtendedContext.copy()
>>> c.Emin = -999
>>> c.Emax = 999
>>> c.next_toward(Decimal('1'), Decimal('2'))
Decimal('1.00000001')
>>> c.next_toward(Decimal('-1E-1007'), Decimal('1'))
Decimal('-0E-1007')
>>> c.next_toward(Decimal('-1.00000003'), Decimal('0'))
Decimal('-1.00000002')
>>> c.next_toward(Decimal('1'), Decimal('0'))
Decimal('0.999999999')
>>> c.next_toward(Decimal('1E-1007'), Decimal('-100'))
Decimal('0E-1007')
>>> c.next_toward(Decimal('-1.00000003'), Decimal('-10'))
Decimal('-1.00000004')
>>> c.next_toward(Decimal('0.00'), Decimal('-0.0000'))
Decimal('-0.00')
>>> c.next_toward(0, 1)
Decimal('1E-1007')
>>> c.next_toward(Decimal(0), 1)
Decimal('1E-1007')
>>> c.next_toward(0, Decimal(1))
Decimal('1E-1007')
Tr rL )r r r r) r) r+ r s zContext.next_towardc C s t |dd}|j| dS )a normalize reduces an operand to its simplest form.
Essentially a plus operation with all trailing zeros removed from the
result.
>>> ExtendedContext.normalize(Decimal('2.1'))
Decimal('2.1')
>>> ExtendedContext.normalize(Decimal('-2.0'))
Decimal('-2')
>>> ExtendedContext.normalize(Decimal('1.200'))
Decimal('1.2')
>>> ExtendedContext.normalize(Decimal('-120'))
Decimal('-1.2E+2')
>>> ExtendedContext.normalize(Decimal('120.00'))
Decimal('1.2E+2')
>>> ExtendedContext.normalize(Decimal('0.00'))
Decimal('0')
>>> ExtendedContext.normalize(6)
Decimal('6')
Tr rL )r rA r r) r) r+ rA s zContext.normalizec C s t |dd}|j| dS )a Returns an indication of the class of the operand.
The class is one of the following strings:
-sNaN
-NaN
-Infinity
-Normal
-Subnormal
-Zero
+Zero
+Subnormal
+Normal
+Infinity
>>> c = ExtendedContext.copy()
>>> c.Emin = -999
>>> c.Emax = 999
>>> c.number_class(Decimal('Infinity'))
'+Infinity'
>>> c.number_class(Decimal('1E-10'))
'+Normal'
>>> c.number_class(Decimal('2.50'))
'+Normal'
>>> c.number_class(Decimal('0.1E-999'))
'+Subnormal'
>>> c.number_class(Decimal('0'))
'+Zero'
>>> c.number_class(Decimal('-0'))
'-Zero'
>>> c.number_class(Decimal('-0.1E-999'))
'-Subnormal'
>>> c.number_class(Decimal('-1E-10'))
'-Normal'
>>> c.number_class(Decimal('-2.50'))
'-Normal'
>>> c.number_class(Decimal('-Infinity'))
'-Infinity'
>>> c.number_class(Decimal('NaN'))
'NaN'
>>> c.number_class(Decimal('-NaN'))
'NaN'
>>> c.number_class(Decimal('sNaN'))
'sNaN'
>>> c.number_class(123)
'+Normal'
Tr rL )r r r r) r) r+ r s / zContext.number_classc C s t |dd}|j| dS )a Plus corresponds to unary prefix plus in Python.
The operation is evaluated using the same rules as add; the
operation plus(a) is calculated as add('0', a) where the '0'
has the same exponent as the operand.
>>> ExtendedContext.plus(Decimal('1.3'))
Decimal('1.3')
>>> ExtendedContext.plus(Decimal('-1.3'))
Decimal('-1.3')
>>> ExtendedContext.plus(-1)
Decimal('-1')
Tr rL )r r r r) r) r+ plus s z Context.plusc C s: t |dd}|j||| d}|tkr2td| n|S dS )a Raises a to the power of b, to modulo if given.
With two arguments, compute a**b. If a is negative then b
must be integral. The result will be inexact unless b is
integral and the result is finite and can be expressed exactly
in 'precision' digits.
With three arguments, compute (a**b) % modulo. For the
three argument form, the following restrictions on the
arguments hold:
- all three arguments must be integral
- b must be nonnegative
- at least one of a or b must be nonzero
- modulo must be nonzero and have at most 'precision' digits
The result of pow(a, b, modulo) is identical to the result
that would be obtained by computing (a**b) % modulo with
unbounded precision, but is computed more efficiently. It is
always exact.
>>> c = ExtendedContext.copy()
>>> c.Emin = -999
>>> c.Emax = 999
>>> c.power(Decimal('2'), Decimal('3'))
Decimal('8')
>>> c.power(Decimal('-2'), Decimal('3'))
Decimal('-8')
>>> c.power(Decimal('2'), Decimal('-3'))
Decimal('0.125')
>>> c.power(Decimal('1.7'), Decimal('8'))
Decimal('69.7575744')
>>> c.power(Decimal('10'), Decimal('0.301029996'))
Decimal('2.00000000')
>>> c.power(Decimal('Infinity'), Decimal('-1'))
Decimal('0')
>>> c.power(Decimal('Infinity'), Decimal('0'))
Decimal('1')
>>> c.power(Decimal('Infinity'), Decimal('1'))
Decimal('Infinity')
>>> c.power(Decimal('-Infinity'), Decimal('-1'))
Decimal('-0')
>>> c.power(Decimal('-Infinity'), Decimal('0'))
Decimal('1')
>>> c.power(Decimal('-Infinity'), Decimal('1'))
Decimal('-Infinity')
>>> c.power(Decimal('-Infinity'), Decimal('2'))
Decimal('Infinity')
>>> c.power(Decimal('0'), Decimal('0'))
Decimal('NaN')
>>> c.power(Decimal('3'), Decimal('7'), Decimal('16'))
Decimal('11')
>>> c.power(Decimal('-3'), Decimal('7'), Decimal('16'))
Decimal('-11')
>>> c.power(Decimal('-3'), Decimal('8'), Decimal('16'))
Decimal('1')
>>> c.power(Decimal('3'), Decimal('7'), Decimal('-16'))
Decimal('11')
>>> c.power(Decimal('23E12345'), Decimal('67E189'), Decimal('123456789'))
Decimal('11729830')
>>> c.power(Decimal('-0'), Decimal('17'), Decimal('1729'))
Decimal('-0')
>>> c.power(Decimal('-23'), Decimal('0'), Decimal('65537'))
Decimal('1')
>>> ExtendedContext.power(7, 7)
Decimal('823543')
>>> ExtendedContext.power(Decimal(7), 7)
Decimal('823543')
>>> ExtendedContext.power(7, Decimal(7), 2)
Decimal('1')
Tr rL r N)r r= r rx )r0 r2 ry r r r) r) r+ power s
I z
Context.powerc C s t |dd}|j|| dS )a
Returns a value equal to 'a' (rounded), having the exponent of 'b'.
The coefficient of the result is derived from that of the left-hand
operand. It may be rounded using the current rounding setting (if the
exponent is being increased), multiplied by a positive power of ten (if
the exponent is being decreased), or is unchanged (if the exponent is
already equal to that of the right-hand operand).
Unlike other operations, if the length of the coefficient after the
quantize operation would be greater than precision then an Invalid
operation condition is raised. This guarantees that, unless there is
an error condition, the exponent of the result of a quantize is always
equal to that of the right-hand operand.
Also unlike other operations, quantize will never raise Underflow, even
if the result is subnormal and inexact.
>>> ExtendedContext.quantize(Decimal('2.17'), Decimal('0.001'))
Decimal('2.170')
>>> ExtendedContext.quantize(Decimal('2.17'), Decimal('0.01'))
Decimal('2.17')
>>> ExtendedContext.quantize(Decimal('2.17'), Decimal('0.1'))
Decimal('2.2')
>>> ExtendedContext.quantize(Decimal('2.17'), Decimal('1e+0'))
Decimal('2')
>>> ExtendedContext.quantize(Decimal('2.17'), Decimal('1e+1'))
Decimal('0E+1')
>>> ExtendedContext.quantize(Decimal('-Inf'), Decimal('Infinity'))
Decimal('-Infinity')
>>> ExtendedContext.quantize(Decimal('2'), Decimal('Infinity'))
Decimal('NaN')
>>> ExtendedContext.quantize(Decimal('-0.1'), Decimal('1'))
Decimal('-0')
>>> ExtendedContext.quantize(Decimal('-0'), Decimal('1e+5'))
Decimal('-0E+5')
>>> ExtendedContext.quantize(Decimal('+35236450.6'), Decimal('1e-2'))
Decimal('NaN')
>>> ExtendedContext.quantize(Decimal('-35236450.6'), Decimal('1e-2'))
Decimal('NaN')
>>> ExtendedContext.quantize(Decimal('217'), Decimal('1e-1'))
Decimal('217.0')
>>> ExtendedContext.quantize(Decimal('217'), Decimal('1e-0'))
Decimal('217')
>>> ExtendedContext.quantize(Decimal('217'), Decimal('1e+1'))
Decimal('2.2E+2')
>>> ExtendedContext.quantize(Decimal('217'), Decimal('1e+2'))
Decimal('2E+2')
>>> ExtendedContext.quantize(1, 2)
Decimal('1')
>>> ExtendedContext.quantize(Decimal(1), 2)
Decimal('1')
>>> ExtendedContext.quantize(1, Decimal(2))
Decimal('1')
Tr rL )r r r r) r) r+ r e s 7 zContext.quantizec C s t dS )zkJust returns 10, as this is Decimal, :)
>>> ExtendedContext.radix()
Decimal('10')
r r r r) r) r+ r s z
Context.radixc C s8 t |dd}|j|| d}|tkr0td| n|S dS )a Returns the remainder from integer division.
The result is the residue of the dividend after the operation of
calculating integer division as described for divide-integer, rounded
to precision digits if necessary. The sign of the result, if
non-zero, is the same as that of the original dividend.
This operation will fail under the same conditions as integer division
(that is, if integer division on the same two operands would fail, the
remainder cannot be calculated).
>>> ExtendedContext.remainder(Decimal('2.1'), Decimal('3'))
Decimal('2.1')
>>> ExtendedContext.remainder(Decimal('10'), Decimal('3'))
Decimal('1')
>>> ExtendedContext.remainder(Decimal('-10'), Decimal('3'))
Decimal('-1')
>>> ExtendedContext.remainder(Decimal('10.2'), Decimal('1'))
Decimal('0.2')
>>> ExtendedContext.remainder(Decimal('10'), Decimal('0.3'))
Decimal('0.1')
>>> ExtendedContext.remainder(Decimal('3.6'), Decimal('1.3'))
Decimal('1.0')
>>> ExtendedContext.remainder(22, 6)
Decimal('4')
>>> ExtendedContext.remainder(Decimal(22), 6)
Decimal('4')
>>> ExtendedContext.remainder(22, Decimal(6))
Decimal('4')
Tr rL r N)r r r rx r r) r) r+ r s
zContext.remainderc C s t |dd}|j|| dS )aG Returns to be "a - b * n", where n is the integer nearest the exact
value of "x / b" (if two integers are equally near then the even one
is chosen). If the result is equal to 0 then its sign will be the
sign of a.
This operation will fail under the same conditions as integer division
(that is, if integer division on the same two operands would fail, the
remainder cannot be calculated).
>>> ExtendedContext.remainder_near(Decimal('2.1'), Decimal('3'))
Decimal('-0.9')
>>> ExtendedContext.remainder_near(Decimal('10'), Decimal('6'))
Decimal('-2')
>>> ExtendedContext.remainder_near(Decimal('10'), Decimal('3'))
Decimal('1')
>>> ExtendedContext.remainder_near(Decimal('-10'), Decimal('3'))
Decimal('-1')
>>> ExtendedContext.remainder_near(Decimal('10.2'), Decimal('1'))
Decimal('0.2')
>>> ExtendedContext.remainder_near(Decimal('10'), Decimal('0.3'))
Decimal('0.1')
>>> ExtendedContext.remainder_near(Decimal('3.6'), Decimal('1.3'))
Decimal('-0.3')
>>> ExtendedContext.remainder_near(3, 11)
Decimal('3')
>>> ExtendedContext.remainder_near(Decimal(3), 11)
Decimal('3')
>>> ExtendedContext.remainder_near(3, Decimal(11))
Decimal('3')
Tr rL )r r r r) r) r+ r s zContext.remainder_nearc C s t |dd}|j|| dS )aN Returns a rotated copy of a, b times.
The coefficient of the result is a rotated copy of the digits in
the coefficient of the first operand. The number of places of
rotation is taken from the absolute value of the second operand,
with the rotation being to the left if the second operand is
positive or to the right otherwise.
>>> ExtendedContext.rotate(Decimal('34'), Decimal('8'))
Decimal('400000003')
>>> ExtendedContext.rotate(Decimal('12'), Decimal('9'))
Decimal('12')
>>> ExtendedContext.rotate(Decimal('123456789'), Decimal('-2'))
Decimal('891234567')
>>> ExtendedContext.rotate(Decimal('123456789'), Decimal('0'))
Decimal('123456789')
>>> ExtendedContext.rotate(Decimal('123456789'), Decimal('+2'))
Decimal('345678912')
>>> ExtendedContext.rotate(1333333, 1)
Decimal('13333330')
>>> ExtendedContext.rotate(Decimal(1333333), 1)
Decimal('13333330')
>>> ExtendedContext.rotate(1333333, Decimal(1))
Decimal('13333330')
Tr rL )r r r r) r) r+ r s zContext.rotatec C s t |dd}||S )a Returns True if the two operands have the same exponent.
The result is never affected by either the sign or the coefficient of
either operand.
>>> ExtendedContext.same_quantum(Decimal('2.17'), Decimal('0.001'))
False
>>> ExtendedContext.same_quantum(Decimal('2.17'), Decimal('0.01'))
True
>>> ExtendedContext.same_quantum(Decimal('2.17'), Decimal('1'))
False
>>> ExtendedContext.same_quantum(Decimal('Inf'), Decimal('-Inf'))
True
>>> ExtendedContext.same_quantum(10000, -1)
True
>>> ExtendedContext.same_quantum(Decimal(10000), -1)
True
>>> ExtendedContext.same_quantum(10000, Decimal(-1))
True
Tr )r rD r r) r) r+ rD s zContext.same_quantumc C s t |dd}|j|| dS )a3 Returns the first operand after adding the second value its exp.
>>> ExtendedContext.scaleb(Decimal('7.50'), Decimal('-2'))
Decimal('0.0750')
>>> ExtendedContext.scaleb(Decimal('7.50'), Decimal('0'))
Decimal('7.50')
>>> ExtendedContext.scaleb(Decimal('7.50'), Decimal('3'))
Decimal('7.50E+3')
>>> ExtendedContext.scaleb(1, 4)
Decimal('1E+4')
>>> ExtendedContext.scaleb(Decimal(1), 4)
Decimal('1E+4')
>>> ExtendedContext.scaleb(1, Decimal(4))
Decimal('1E+4')
Tr rL )r r r r) r) r+ r $ s zContext.scalebc C s t |dd}|j|| dS )a{ Returns a shifted copy of a, b times.
The coefficient of the result is a shifted copy of the digits
in the coefficient of the first operand. The number of places
to shift is taken from the absolute value of the second operand,
with the shift being to the left if the second operand is
positive or to the right otherwise. Digits shifted into the
coefficient are zeros.
>>> ExtendedContext.shift(Decimal('34'), Decimal('8'))
Decimal('400000000')
>>> ExtendedContext.shift(Decimal('12'), Decimal('9'))
Decimal('0')
>>> ExtendedContext.shift(Decimal('123456789'), Decimal('-2'))
Decimal('1234567')
>>> ExtendedContext.shift(Decimal('123456789'), Decimal('0'))
Decimal('123456789')
>>> ExtendedContext.shift(Decimal('123456789'), Decimal('+2'))
Decimal('345678900')
>>> ExtendedContext.shift(88888888, 2)
Decimal('888888800')
>>> ExtendedContext.shift(Decimal(88888888), 2)
Decimal('888888800')
>>> ExtendedContext.shift(88888888, Decimal(2))
Decimal('888888800')
Tr rL )r r r r) r) r+ r 7 s z
Context.shiftc C s t |dd}|j| dS )a Square root of a non-negative number to context precision.
If the result must be inexact, it is rounded using the round-half-even
algorithm.
>>> ExtendedContext.sqrt(Decimal('0'))
Decimal('0')
>>> ExtendedContext.sqrt(Decimal('-0'))
Decimal('-0')
>>> ExtendedContext.sqrt(Decimal('0.39'))
Decimal('0.624499800')
>>> ExtendedContext.sqrt(Decimal('100'))
Decimal('10')
>>> ExtendedContext.sqrt(Decimal('1'))
Decimal('1')
>>> ExtendedContext.sqrt(Decimal('1.0'))
Decimal('1.0')
>>> ExtendedContext.sqrt(Decimal('1.00'))
Decimal('1.0')
>>> ExtendedContext.sqrt(Decimal('7'))
Decimal('2.64575131')
>>> ExtendedContext.sqrt(Decimal('10'))
Decimal('3.16227766')
>>> ExtendedContext.sqrt(2)
Decimal('1.41421356')
>>> ExtendedContext.prec
9
Tr rL )r rN r r) r) r+ rN U s z Context.sqrtc C s8 t |dd}|j|| d}|tkr0td| n|S dS )a& Return the difference between the two operands.
>>> ExtendedContext.subtract(Decimal('1.3'), Decimal('1.07'))
Decimal('0.23')
>>> ExtendedContext.subtract(Decimal('1.3'), Decimal('1.30'))
Decimal('0.00')
>>> ExtendedContext.subtract(Decimal('1.3'), Decimal('2.07'))
Decimal('-0.77')
>>> ExtendedContext.subtract(8, 5)
Decimal('3')
>>> ExtendedContext.subtract(Decimal(8), 5)
Decimal('3')
>>> ExtendedContext.subtract(8, Decimal(5))
Decimal('3')
Tr rL r N)r r r rx r r) r) r+ subtractu s
zContext.subtractc C s t |dd}|j| dS )a Convert to a string, using engineering notation if an exponent is needed.
Engineering notation has an exponent which is a multiple of 3. This
can leave up to 3 digits to the left of the decimal place and may
require the addition of either one or two trailing zeros.
The operation is not affected by the context.
>>> ExtendedContext.to_eng_string(Decimal('123E+1'))
'1.23E+3'
>>> ExtendedContext.to_eng_string(Decimal('123E+3'))
'123E+3'
>>> ExtendedContext.to_eng_string(Decimal('123E-10'))
'12.3E-9'
>>> ExtendedContext.to_eng_string(Decimal('-123E-12'))
'-123E-12'
>>> ExtendedContext.to_eng_string(Decimal('7E-7'))
'700E-9'
>>> ExtendedContext.to_eng_string(Decimal('7E+1'))
'70'
>>> ExtendedContext.to_eng_string(Decimal('0E+1'))
'0.00E+3'
Tr rL )r r r r) r) r+ r s zContext.to_eng_stringc C s t |dd}|j| dS )zyConverts a number to a string, using scientific notation.
The operation is not affected by the context.
Tr rL )r r r r) r) r+
to_sci_string s zContext.to_sci_stringc C s t |dd}|j| dS )ak Rounds to an integer.
When the operand has a negative exponent, the result is the same
as using the quantize() operation using the given operand as the
left-hand-operand, 1E+0 as the right-hand-operand, and the precision
of the operand as the precision setting; Inexact and Rounded flags
are allowed in this operation. The rounding mode is taken from the
context.
>>> ExtendedContext.to_integral_exact(Decimal('2.1'))
Decimal('2')
>>> ExtendedContext.to_integral_exact(Decimal('100'))
Decimal('100')
>>> ExtendedContext.to_integral_exact(Decimal('100.0'))
Decimal('100')
>>> ExtendedContext.to_integral_exact(Decimal('101.5'))
Decimal('102')
>>> ExtendedContext.to_integral_exact(Decimal('-101.5'))
Decimal('-102')
>>> ExtendedContext.to_integral_exact(Decimal('10E+5'))
Decimal('1.0E+6')
>>> ExtendedContext.to_integral_exact(Decimal('7.89E+77'))
Decimal('7.89E+77')
>>> ExtendedContext.to_integral_exact(Decimal('-Inf'))
Decimal('-Infinity')
Tr rL )r rH r r) r) r+ rH s zContext.to_integral_exactc C s t |dd}|j| dS )aL Rounds to an integer.
When the operand has a negative exponent, the result is the same
as using the quantize() operation using the given operand as the
left-hand-operand, 1E+0 as the right-hand-operand, and the precision
of the operand as the precision setting, except that no flags will
be set. The rounding mode is taken from the context.
>>> ExtendedContext.to_integral_value(Decimal('2.1'))
Decimal('2')
>>> ExtendedContext.to_integral_value(Decimal('100'))
Decimal('100')
>>> ExtendedContext.to_integral_value(Decimal('100.0'))
Decimal('100')
>>> ExtendedContext.to_integral_value(Decimal('101.5'))
Decimal('102')
>>> ExtendedContext.to_integral_value(Decimal('-101.5'))
Decimal('-102')
>>> ExtendedContext.to_integral_value(Decimal('10E+5'))
Decimal('1.0E+6')
>>> ExtendedContext.to_integral_value(Decimal('7.89E+77'))
Decimal('7.89E+77')
>>> ExtendedContext.to_integral_value(Decimal('-Inf'))
Decimal('-Infinity')
Tr rL )r r r r) r) r+ r s zContext.to_integral_value) NNNNNNNNN)N)rS )N)Xr4 r5 r6 r7 r r r r r r r rN r rI rM r rj r r r r r r rJ r r rn r r rS r rT rP rX r r r rY r r r rX r r\ r] rC r r_ r r` r ra rb rl ro rp r~ r r r r r r r r r r r r rA r r r r r r r r rD r r rN r r r rH r r r) r) r) r+ r s
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P:&" c @ s" e Zd ZdZdddZdd ZdS )ro rC rW rX Nc C sf |d kr d | _ d| _d | _nFt|trD|j| _ t|j| _|j| _n |d | _ |d | _|d | _d S )Nr& r. r_ )rC rW rX re r r; r< rQ )r0 rz r) r) r+ r s
z_WorkRep.__init__c C s d| j | j| jf S )Nz (%r, %r, %r)r r r) r) r+ r s z_WorkRep.__repr__)N)r4 r5 r6 r r r r) r) r) r+ ro s
ro c C s | j |j k r|}| }n| }|}tt|j}tt|j}|j td|| d }||j d |k rpd|_||_ | jd|j |j 9 _|j |_ | |fS )zcNormalizes op1, op2 to have the same exp and length of coefficient.
Done during addition.
r r_ r. r )rX rl rf rW r )r r rF tmpr Ztmp_lenZ other_lenrX r) r) r+ r s r c C sb | dkr dS |dkr | d| S t t| }t|t|d }|| k rPdS | d| S dS )a Given integers n and e, return n * 10**e if it's an integer, else None.
The computation is designed to avoid computing large powers of 10
unnecessarily.
>>> _decimal_lshift_exact(3, 4)
30000
>>> _decimal_lshift_exact(300, -999999999) # returns None
r& r rS N)rf rn rl rstrip)r9 r Zstr_nZval_nr) r) r+ r( ( s r( c C sB | dks|dkrt dd}||kr>||| | d? }}q |S )zClosest integer to the square root of the positive integer n. a is
an initial approximation to the square root. Any positive integer
will do for a, but the closer a is to the square root of n the
faster convergence will be.
r& z3Both arguments to _sqrt_nearest should be positive.r. )rr )r9 r2 ry r) r) r+
_sqrt_nearest= s r c C s2 d|> | |? }}|d| |d @ |d@ |k S )zGiven an integer x and a nonnegative integer shift, return closest
integer to x / 2**shift; use round-to-even in case of a tie.
r. r_ r) )r+ r ry r r) r) r+ _rshift_nearestL s r c C s& t | |\}}|d| |d@ |k S )zaClosest integer to a/b, a and b positive integers; rounds to even
in the case of a tie.
r_ r. )r )r2 ry r r r) r) r+ _div_nearestT s r r" c C s | | }d}||kr(t ||| > |ksD||krxt ||| ? |krxt|| d> |t||t|| | }|d7 }q tdtt| d| }t||}t||}t|d ddD ] }t||t|| | }qt|| |S )a Integer approximation to M*log(x/M), with absolute error boundable
in terms only of x/M.
Given positive integers x and M, return an integer approximation to
M * log(x/M). For L = 8 and 0.1 <= x/M <= 10 the difference
between the approximation and the exact result is at most 22. For
L = 8 and 1.0 <= x/M <= 10.0 the difference is at most 15. In
both cases these are upper bounds on the error; it will usually be
much smaller.r& r. r] r )rn r r r rW rl rf r ) r+ MLr. RTZyshiftwr r) r) r+ _ilog\ s"
r c
C s |d7 }t t| }|| || dk }|dkrd| }|| | }|dkrZ| d| 9 } nt| d| } t| |}t|}t|| |}|| } nd}t|d| } t| | dS )zGiven integers c, e and p with c > 0, p >= 0, compute an integer
approximation to 10**p * log10(c*10**e), with an absolute error of
at most 1. Assumes that c*10**e is not exactly 1.r_ r. r& r r& )rl rf r r
_log10_digits)
rL r r* rM r r r log_dZlog_10Z log_tenpowerr) r) r+ rn s
rn c C s |d7 }t t| }|| || dk }|dkrr|| | }|dkrR| d| 9 } nt| d| } t| d| }nd}|rt tt|d }|| dkrt|t|| d| }qd}nd}t|| dS )zGiven integers c, e and p with c > 0, compute an integer
approximation to 10**p * log(c*10**e), with an absolute error of
at most 1. Assumes that c*10**e is not exactly 1.r_ r. r& r r& )rl rf r r rn r ) rL r r* rM r r r r; Z f_log_tenr) r) r+ rj s" rj c @ s e Zd ZdZdd Zdd ZdS )
_Log10MemoizezClass to compute, store, and allow retrieval of, digits of the
constant log(10) = 2.302585.... This constant is needed by
Decimal.ln, Decimal.log10, Decimal.exp and Decimal.__pow__.c C s
d| _ d S )NZ/23025850929940456840179914546843642076011014886)r~ r r) r) r+ r s z_Log10Memoize.__init__c C s |dk rt d|t| jkrd}d|| d }tttd| |d}|| d d| krbql|d7 }q"|ddd | _t| jd|d
S ) ztGiven an integer p >= 0, return floor(10**p)*log(10).
For example, self.getdigits(3) returns 2302.
r& zp should be nonnegativer] r r_ r& NrS r r. )rr rl r~ rf r r r rW )r0 r* r; r r~ r) r) r+ getdigits s
z_Log10Memoize.getdigitsN)r4 r5 r6 r7 r r r) r) r) r+ r s r c C s t | |> | }tdtt| d| }t| |}||> }t|d ddD ]}t| || || }qPt|d ddD ]"}||d > }t||| |}q||| S )zGiven integers x and M, M > 0, such that x/M is small in absolute
value, compute an integer approximation to M*exp(x/M). For 0 <=
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is usually much smaller).r r] r. r& r r_ )r' rW rl rf r r ) r+ r r r r r. ZMshiftr r r) r) r+ _iexp s
r c C s |d7 }t d|tt| d }|| }|| }|dkrH| d| }n| d| }t|t|\}}t|d| }tt|d| d|| d fS )a Compute an approximation to exp(c*10**e), with p decimal places of
precision.
Returns integers d, f such that:
10**(p-1) <= d <= 10**p, and
(d-1)*10**f < exp(c*10**e) < (d+1)*10**f
In other words, d*10**f is an approximation to exp(c*10**e) with p
digits of precision, and with an error in d of at most 1. This is
almost, but not quite, the same as the error being < 1ulp: when d
= 10**(p-1) the error could be up to 10 ulp.r_ r& r. r i r] )r rl rf r r r r ) rL r r* r; r r ZcshiftZquotr1 r) r) r+ rZ $ s rZ c C s t tt|| }t| ||| d }|| }|dkrJ|| d| }nt|| d| }|dkrt t| | dk|dkkrd|d d d| } }
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fS )a5 Given integers xc, xe, yc and ye representing Decimals x = xc*10**xe and
y = yc*10**ye, compute x**y. Returns a pair of integers (c, e) such that:
10**(p-1) <= c <= 10**p, and
(c-1)*10**e < x**y < (c+1)*10**e
in other words, c*10**e is an approximation to x**y with p digits
of precision, and with an error in c of at most 1. (This is
almost, but not quite, the same as the error being < 1ulp: when c
== 10**(p-1) we can only guarantee error < 10ulp.)
We assume that: x is positive and not equal to 1, and y is nonzero.
r. r& r )rl rf rn rj r rZ ) r, r- r/ r0 r* ry Zlxcr Zpcr rX r) r) r+ r6 H s
r6 r& F 5 ( rc r r ) r 2345678rD c C s0 | dkrt dt| }dt| ||d S )z@Compute a lower bound for 100*log10(c) for a positive integer c.r& z0The argument to _log10_lb should be nonnegative.r& )rr rf rl )rL Z
correctionZstr_cr) r) r+ r) r s r) c C sL t | tr| S t | tr t| S |r8t | tr8t| S |rHtd| tS )zConvert other to Decimal.
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If allow_float is true, allow conversion from float; this
is used in the comparison methods (__eq__ and friends).
r )re r rW rv rw rx r )r r Z allow_floatr) r) r+ r } s
r c C s t |tr| |fS t |tjrR| jsDt| jtt| j |j
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rr|jdkrr|j}t |trt }|rd|jt< n |td | t|fS ttfS )zGiven a Decimal instance self and a Python object other, return
a pair (s, o) of Decimal instances such that "s op o" is
equivalent to "self op other" for any of the 6 comparison
operators "op".
r& r. rb )re r _numbersZRationalrR r: r; rf rW r< denominatorrQ numeratorZComplexr r rv r r9 r rj rw r )r0 r r r1 r) r) r+ r s(
r r% i?B i)rF rE r8 r9 rG rB r r r` )rF rE r8 r9 a # A numeric string consists of:
# \s*
(?P[-+])? # an optional sign, followed by either...
(
(?=\d|\.\d) # ...a number (with at least one digit)
(?P\d*) # having a (possibly empty) integer part
(\.(?P\d*))? # followed by an optional fractional part
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|d < |d dk rt|d |d< |d dkr|d dks|d dkrd|d< |d dkrfd|d< |dkr&t }|d dk r@td| |d |d< |d |d< |d |d< n*|d dkr|d|d< ddg|d< d|d< |S ) a Parse and validate a format specifier.
Turns a standard numeric format specifier into a dict, with the
following entries:
fill: fill character to pad field to minimum width
align: alignment type, either '<', '>', '=' or '^'
sign: either '+', '-' or ' '
minimumwidth: nonnegative integer giving minimum width
zeropad: boolean, indicating whether to pad with zeros
thousands_sep: string to use as thousands separator, or ''
grouping: grouping for thousands separators, in format
used by localeconv
decimal_point: string to use for decimal point
precision: nonnegative integer giving precision, or None
type: one of the characters 'eEfFgG%', or None
NzInvalid format specifier: fillalignzeropadz7Fill character conflicts with '0' in format specifier: z2Alignment conflicts with '0' in format specifier: >rC rV minimumwidthrS r r& r ZgGnr. r9 r
thousands_sepzJExplicit thousands separator conflicts with 'n' type in format specifier: grouping
decimal_pointrU r] r ) _parse_format_specifier_regexmatchrr groupdictrW _locale
localeconv) format_specr r{ Z format_dictr
r r) r) r+ r sT
r c C s |d }|d }||t | t | }|d }|dkrF| | | }nj|dkr\|| | }nT|dkrr| | | }n>|dkrt |d }|d | | | ||d }ntd
|S ) zGiven an unpadded, non-aligned numeric string 'body' and sign
string 'sign', add padding and alignment conforming to the given
format specifier dictionary 'spec' (as produced by
parse_format_specifier).
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