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3
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dZdS ) a A dumb and slow but simple dbm clone.
For database spam, spam.dir contains the index (a text file),
spam.bak *may* contain a backup of the index (also a text file),
while spam.dat contains the data (a binary file).
XXX TO DO:
- seems to contain a bug when updating...
- reclaim free space (currently, space once occupied by deleted or expanded
items is never reused)
- support concurrent access (currently, if two processes take turns making
updates, they can mess up the index)
- support efficient access to large databases (currently, the whole index
is read when the database is opened, and some updates rewrite the whole index)
- support opening for read-only (flag = 'm')
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dd Zdd Zdd Zdd Zdd Zd d Zd d ZeZd d! Zd"d# ZeZd$d% Zd&d' Zd(d) Zd*S ), _Databasecc C sJ || _ |dk| _|d | _|d | _|d | _d | _| j| | j d S )Nrz.dirz.datz.bak)_mode _readonly_dirfile_datfile_bakfile_index_create_update)selfZ filebasenamemodeflag r /usr/lib64/python3.6/dbm/dumb.py__init__0 s
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C s: t j| jd}|j| |j| W d Q R X |t|fS )Nzrb+)r r r
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z_Database._setvalc C sP || j |< tj| jddd*}| j| j |jd|jd|f W d Q R X d S )NazLatin-1)r z%r, %r
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d| _ || j kr| j
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Nr z'The database is opened for reading onlyr< )r zutf-8z keys must be bytes or stringsz values must be bytes or stringsTr= )r r r r r5 r6 r( bytes bytearray TypeErrorr3 r% r rG rD rA rB rE )r r* rC r r9 r: Z oldblocksZ newblocksr r r __setitem__ s,
z_Database.__setitem__c C sT | j r dd l}|jdtdd t|tr2|jd}| j d| _| j |= | j
d S )Nr z'The database is opened for reading onlyr< )r zutf-8T) r r r r r5 r6 r( r3 r% r r2 )r r* r r r r __delitem__ s
z_Database.__delitem__c C s. y
t | jS tk
r( tdd Y nX d S )Nz"DBM object has already been closed)listr rJ r )r r r r keys s
z_Database.keysc s j fdd jj D S )Nc s g | ]}| | fqS r r ).0r* )r r r
s z#_Database.items..)r3 r rN )r r )r r r. s z_Database.itemsc C sP t |tr|jd}y
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z_Database.__len__c C s, z | j W d d | _ | _ | _| _X d S )N)r2 r r
r r )r r r r r" s z_Database.closec C s t | jdr | jj|| j d S )Nchmod)hasattrr rU r )r filer r r r! s z_Database._chmodc C s | S )Nr )r r r r __enter__! s z_Database.__enter__c G s | j d S )N)r" )r argsr r r __exit__$ s z_Database.__exit__N)r ) __name__
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S ) aE Open the database file, filename, and return corresponding object.
The flag argument, used to control how the database is opened in the
other DBM implementations, supports only the semantics of 'c' and 'n'
values. Other values will default to the semantics of 'c' value:
the database will always opened for update and will be created if it
does not exist.
The optional mode argument is the UNIX mode of the file, used only when
the database has to be created. It defaults to octal code 0o666 (and
will be modified by the prevailing umask).
r r r r r Nz)Flag must be one of 'r', 'w', 'c', or 'n'r< )r )r )r r r r )r umaskAttributeErrorr r r r )rW r r Zumr r r r r ( s
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