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s4 Utilities for with-statement contexts. See PEP 343.i����N( t wraps( t warnt contextmanagert nestedt closingt GeneratorContextManagerc B s) e Z d Z d � Z d � Z d � Z RS( s% Helper for @contextmanager decorator.c C s
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__module__t __doc__R R R ( ( ( s /usr/lib/python2.7/contextlib.pyR s c s t � � � f d � � } | S( s� @contextmanager decorator.
Typical usage:
@contextmanager
def some_generator(<arguments>):
<setup>
try:
yield <value>
finally:
<cleanup>
This makes this:
with some_generator(<arguments>) as <variable>:
<body>
equivalent to this:
<setup>
try:
<variable> = <value>
<body>
finally:
<cleanup>
c s t � | | � � S( N( R ( t argst kwds( t func( s /usr/lib/python2.7/contextlib.pyt helperR s ( R ( R R ( ( R s /usr/lib/python2.7/contextlib.pyR 6 s c g s� t d t d � g } g } d } zc yI x= | D]5 } | j } | j } | j | � � | j | � q/ W| VWn t j � } n XWd xE | r� | j � } y | | � r� d } n Wq� t j � } q� Xq� W| d k r� | d | d | d � n Xd S(
s� Combine multiple context managers into a single nested context manager.
This function has been deprecated in favour of the multiple manager form
of the with statement.
The one advantage of this function over the multiple manager form of the
with statement is that argument unpacking allows it to be
used with a variable number of context managers as follows:
with nested(*managers):
do_something()
s> With-statements now directly support multiple context managersi Ni i i ( NNN( NNN( NNN( R t DeprecationWarningR
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c B s) e Z d Z d � Z d � Z d � Z RS( s2 Context to automatically close something at the end of a block.
Code like this:
with closing(<module>.open(<arguments>)) as f:
<block>
is equivalent to this:
f = <module>.open(<arguments>)
try:
<block>
finally:
f.close()
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