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This module allows you to spawn processes, connect to their
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For a complete description of this module see the Python documentation.
Main API
========
run(...): Runs a command, waits for it to complete, then returns a
CompletedProcess instance.
Popen(...): A class for flexibly executing a command in a new process
Constants
---------
DEVNULL: Special value that indicates that os.devnull should be used
PIPE: Special value that indicates a pipe should be created
STDOUT: Special value that indicates that stderr should go to stdout
Older API
=========
call(...): Runs a command, waits for it to complete, then returns
the return code.
check_call(...): Same as call() but raises CalledProcessError()
if return code is not 0
check_output(...): Same as check_call() but returns the contents of
stdout instead of a return code
getoutput(...): Runs a command in the shell, waits for it to complete,
then returns the output
getstatusoutput(...): Runs a command in the shell, waits for it to complete,
then returns a (exitcode, output) tuple
N) monotonicPopenPIPESTDOUTcall
check_callgetstatusoutput getoutput check_outputrunCalledProcessErrorDEVNULLSubprocessErrorTimeoutExpiredCompletedProcessTF)CREATE_NEW_CONSOLECREATE_NEW_PROCESS_GROUPSTD_INPUT_HANDLESTD_OUTPUT_HANDLESTD_ERROR_HANDLESW_HIDESTARTF_USESTDHANDLESSTARTF_USESHOWWINDOWABOVE_NORMAL_PRIORITY_CLASSBELOW_NORMAL_PRIORITY_CLASSHIGH_PRIORITY_CLASSIDLE_PRIORITY_CLASSNORMAL_PRIORITY_CLASSREALTIME_PRIORITY_CLASSCREATE_NO_WINDOWDETACHED_PROCESSCREATE_DEFAULT_ERROR_MODECREATE_BREAKAWAY_FROM_JOBr r r r r r r r STARTUPINFOr r r r r r r r r! r" c @ s e Zd ZdS )r N)__name__
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rg c C sV ddddddd} t }| D ].\}}ttj|}|dkr |d || q tjjrd|d
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O sL t ||8}z|j| dW W 5 Q R S | Y nX W 5 Q R X dS )zRun command with arguments. Wait for command to complete or
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r N)r waitkill)r= popenargskwargspr' r' r( r L s c O s6 t | |}|r2|d}|dkr(| d }t||dS )aO Run command with arguments. Wait for command to complete. If
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check_call(["ls", "-l"])
rf Nr )r getr )r r retcoder+ r' r' r( r ] s
c O sT d|krt dd|kr<|d dkr<|ddr4dnd|d< t|t| d d
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CalledProcessError object will have the return code in the returncode
attribute and output in the output attribute.
The arguments are the same as for the Popen constructor. Example:
>>> check_output(["ls", "-l", "/dev/null"])
b'crw-rw-rw- 1 root root 1, 3 Oct 18 2007 /dev/null\n'
The stdout argument is not allowed as it is used internally.
To capture standard error in the result, use stderr=STDOUT.
>>> check_output(["/bin/sh", "-c",
... "ls -l non_existent_file ; exit 0"],
... stderr=STDOUT)
b'ls: non_existent_file: No such file or directory\n'
There is an additional optional argument, "input", allowing you to
pass a string to the subprocess's stdin. If you use this argument
you may not also use the Popen constructor's "stdin" argument, as
it too will be used internally. Example:
>>> check_output(["sed", "-e", "s/foo/bar/"],
... input=b"when in the course of fooman events\n")
b'when in the course of barman events\n'
By default, all communication is in bytes, and therefore any "input"
should be bytes, and the return value will be bytes. If in text mode,
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stdout: The standard output (None if not captured).
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Nc C s || _ || _|| _|| _d S r) )rf r* r6 r- )r. rf r* r6 r- r' r' r( r/ s zCompletedProcess.__init__c C sh d | jd | jg}| jd k r4|d | j | jd k rP|d | j d t| jd|S )Nz args={!r}zreturncode={!r}z stdout={!r}z stderr={!r}z{}({})z, ) formatrf r* r6 re r- typer$ join)r. rf r' r' r( rO s
zCompletedProcess.__repr__c C s | j r t| j | j| j| jdS )z6Raise CalledProcessError if the exit code is non-zero.N)r* r rf r6 r- r3 r' r' r( check_returncode s z!CompletedProcess.check_returncode)NN)r$ r% r& r: r/ rO r r' r' r' r( r s
)r capture_outputr= r c O s | dk r&| ddk r tdt|d< |r^| ddk sF| ddk rNtdt|d< t|d< t||}z|j| |d\}}W n^ tk
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If check is True and the exit code was non-zero, it raises a
CalledProcessError. The CalledProcessError object will have the return code
in the returncode attribute, and output & stderr attributes if those streams
were captured.
If timeout is given, and the process takes too long, a TimeoutExpired
exception will be raised.
There is an optional argument "input", allowing you to
pass bytes or a string to the subprocess's stdin. If you use this argument
you may not also use the Popen constructor's "stdin" argument, as
it will be used internally.
By default, all communication is in bytes, and therefore any "input" should
be bytes, and the stdout and stderr will be bytes. If in text mode, any
"input" should be a string, and stdout and stderr will be strings decoded
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Nstdinz/stdin and input arguments may not both be used.r6 r- z@stdout and stderr arguments may not be used with capture_output.r r, r- )r r2 r r communicater r
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Translate a sequence of arguments into a command line
string, using the same rules as the MS C runtime:
1) Arguments are delimited by white space, which is either a
space or a tab.
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interpreted as a single argument, regardless of white space
contained within. A quoted string can be embedded in an
argument.
3) A double quotation mark preceded by a backslash is
interpreted as a literal double quotation mark.
4) Backslashes are interpreted literally, unless they
immediately precede a double quotation mark.
5) If backslashes immediately precede a double quotation mark,
every pair of backslashes is interpreted as a literal
backslash. If the number of backslashes is odd, the last
backslash escapes the next double quotation mark as
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F "\ z\"r )maposfsdecodere lenr r )seqresult needquoter bs_bufcr' r' r( list2cmdline s4
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C sl zt | ddtd}d}W n. tk
rF } z|j}|j}W 5 d}~X Y nX |dd dkrd|dd }||fS )a Return (exitcode, output) of executing cmd in a shell.
Execute the string 'cmd' in a shell with 'check_output' and
return a 2-tuple (status, output). The locale encoding is used
to decode the output and process newlines.
A trailing newline is stripped from the output.
The exit status for the command can be interpreted
according to the rules for the function 'wait'. Example:
>>> import subprocess
>>> subprocess.getstatusoutput('ls /bin/ls')
(0, '/bin/ls')
>>> subprocess.getstatusoutput('cat /bin/junk')
(1, 'cat: /bin/junk: No such file or directory')
>>> subprocess.getstatusoutput('/bin/junk')
(127, 'sh: /bin/junk: not found')
>>> subprocess.getstatusoutput('/bin/kill $$')
(-15, '')
T)shelltextr- r Nr^
)r
r r r, r* )r+ dataexitcodeexr' r' r( r N s c C s t | d S )a% Return output (stdout or stderr) of executing cmd in a shell.
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value is a string containing the command's output. Example:
>>> import subprocess
>>> subprocess.getoutput('ls /bin/ls')
'/bin/ls'
rv )r )r+ r' r' r( r m s
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subprocess requires a posix_spawn() implementation that properly reports
errors to the parent process, & sets errno on the following failures:
* Process attribute actions failed.
* File actions failed.
* exec() failed.
Prefer an implementation which can use vfork() in some cases for best
performance.
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executable: A replacement program to execute.
stdin, stdout and stderr: These specify the executed programs' standard
input, standard output and standard error file handles, respectively.
preexec_fn: (POSIX only) An object to be called in the child process
just before the child is executed.
close_fds: Controls closing or inheriting of file descriptors.
shell: If true, the command will be executed through the shell.
cwd: Sets the current directory before the child is executed.
env: Defines the environment variables for the new process.
text: If true, decode stdin, stdout and stderr using the given encoding
(if set) or the system default otherwise.
universal_newlines: Alias of text, provided for backwards compatibility.
startupinfo and creationflags (Windows only)
restore_signals (POSIX only)
start_new_session (POSIX only)
pass_fds (POSIX only)
encoding and errors: Text mode encoding and error handling to use for
file objects stdin, stdout and stderr.
Attributes:
stdin, stdout, stderr, pid, returncode
Fr^ NTr r' )encodingerrorsr c C sl t t | _d| _d| _|dkr(d}t|ts:tdt rP|dk rt
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r$ Y nX Y nX W 5 d| _ X | j | |d}||fS )a9 Interact with process: Send data to stdin and close it.
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reached. Wait for process to terminate.
The optional "input" argument should be data to be sent to the
child process, or None, if no data should be sent to the child.
communicate() returns a tuple (stdout, stderr).
By default, all communication is in bytes, and therefore any
"input" should be bytes, and the (stdout, stderr) will be bytes.
If in text mode (indicated by self.text_mode), any "input" should
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zPopen.communicatec C s | S )zSCheck if child process has terminated. Set and return returncode
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