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contextlib.cpython-33.pyc
� �� f�# c @ s� d Z d d l Z d d l m Z d d l m Z d d d d g Z Gd d � d e � Z Gd d � d e � Z d d � Z Gd d � d e � Z Gd d � d e � Z d S( u4 Utilities for with-statement contexts. See PEP 343.i N( u deque( u wrapsu contextmanageru closingu ContextDecoratoru ExitStackc B s2 | Ee Z d Z d Z d d � Z d d � Z d S( u ContextDecoratoruJ A base class or mixin that enables context managers to work as decorators.c C s | S( u6 Return a recreated instance of self. Allows an otherwise one-shot context manager like _GeneratorContextManager to support use as a decorator via implicit recreation. This is a private interface just for _GeneratorContextManager. See issue #11647 for details. ( ( u self( ( u/ /opt/alt/python33/lib64/python3.3/contextlib.pyu _recreate_cm s u ContextDecorator._recreate_cmc s% t � � � � f d d � � } | S( Nc s$ � j � � � | | � SWd QXd S( N( u _recreate_cm( u argsu kwds( u funcu self( u/ /opt/alt/python33/lib64/python3.3/contextlib.pyu inner s u( ContextDecorator.__call__.<locals>.inner( u wraps( u selfu funcu inner( ( u funcu selfu/ /opt/alt/python33/lib64/python3.3/contextlib.pyu __call__ s !u ContextDecorator.__call__N( u __name__u __module__u __qualname__u __doc__u _recreate_cmu __call__( u __locals__( ( u/ /opt/alt/python33/lib64/python3.3/contextlib.pyu ContextDecorator s c B sJ | Ee Z d Z d Z d d � Z d d � Z d d � Z d d � Z d S( u _GeneratorContextManageru% Helper for @contextmanager decorator.c O s3 | | | � | _ | | | | _ | _ | _ d S( N( u genu funcu argsu kwds( u selfu funcu argsu kwds( ( u/ /opt/alt/python33/lib64/python3.3/contextlib.pyu __init__$ s u! _GeneratorContextManager.__init__c C s | j | j | j | j � S( N( u __class__u funcu argsu kwds( u self( ( u/ /opt/alt/python33/lib64/python3.3/contextlib.pyu _recreate_cm( s u% _GeneratorContextManager._recreate_cmc C s6 y t | j � SWn t k r1 t d � � Yn Xd S( Nu generator didn't yield( u nextu genu StopIterationu RuntimeError( u self( ( u/ /opt/alt/python33/lib64/python3.3/contextlib.pyu __enter__. s u" _GeneratorContextManager.__enter__c C s� | d k rE y t | j � Wn t k r5 d SYq� Xt d � � n� | d k r] | � } n y& | j j | | | � t d � � WnR t k r� } z | | k SWYd d } ~ Xn$ t j � d | k r� � n Yn Xd S( Nu generator didn't stopu# generator didn't stop after throw()i ( u Noneu nextu genu StopIterationu RuntimeErroru throwu sysu exc_info( u selfu typeu valueu tracebacku exc( ( u/ /opt/alt/python33/lib64/python3.3/contextlib.pyu __exit__4 s u! _GeneratorContextManager.__exit__N( u __name__u __module__u __qualname__u __doc__u __init__u _recreate_cmu __enter__u __exit__( u __locals__( ( u/ /opt/alt/python33/lib64/python3.3/contextlib.pyu _GeneratorContextManager! s u _GeneratorContextManagerc s" t � � � f d d � � } | S( u� @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( u _GeneratorContextManager( u argsu kwds( u func( u/ /opt/alt/python33/lib64/python3.3/contextlib.pyu helperq s u contextmanager.<locals>.helper( u wraps( u funcu helper( ( u funcu/ /opt/alt/python33/lib64/python3.3/contextlib.pyu contextmanagerU s c B s> | Ee Z d Z d Z d d � Z d d � Z d d � Z d S( u closingu2 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() c C s | | _ d S( N( u thing( u selfu thing( ( u/ /opt/alt/python33/lib64/python3.3/contextlib.pyu __init__� s u closing.__init__c C s | j S( N( u thing( u self( ( u/ /opt/alt/python33/lib64/python3.3/contextlib.pyu __enter__� s u closing.__enter__c G s | j j � d S( N( u thingu close( u selfu exc_info( ( u/ /opt/alt/python33/lib64/python3.3/contextlib.pyu __exit__� s u closing.__exit__N( u __name__u __module__u __qualname__u __doc__u __init__u __enter__u __exit__( u __locals__( ( u/ /opt/alt/python33/lib64/python3.3/contextlib.pyu closingw s c B s� | Ee Z d Z d Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d S( u ExitStacku� Context manager for dynamic management of a stack of exit callbacks For example: with ExitStack() as stack: files = [stack.enter_context(open(fname)) for fname in filenames] # All opened files will automatically be closed at the end of # the with statement, even if attempts to open files later # in the list raise an exception c C s t � | _ d S( N( u dequeu _exit_callbacks( u self( ( u/ /opt/alt/python33/lib64/python3.3/contextlib.pyu __init__� s u ExitStack.__init__c C s+ t | � � } | j | _ t � | _ | S( u? Preserve the context stack by transferring it to a new instance( u typeu _exit_callbacksu deque( u selfu new_stack( ( u/ /opt/alt/python33/lib64/python3.3/contextlib.pyu pop_all� s u ExitStack.pop_allc s/ � � f d d � } � | _ | j | � d S( u: Helper to correctly register callbacks to __exit__ methodsc s � � | � S( N( ( u exc_details( u cmu cm_exit( u/ /opt/alt/python33/lib64/python3.3/contextlib.pyu _exit_wrapper� s u. ExitStack._push_cm_exit.<locals>._exit_wrapperN( u __self__u push( u selfu cmu cm_exitu _exit_wrapper( ( u cmu cm_exitu/ /opt/alt/python33/lib64/python3.3/contextlib.pyu _push_cm_exit� s u ExitStack._push_cm_exitc C sR t | � } y | j } Wn" t k r= | j j | � Yn X| j | | � | S( u Registers a callback with the standard __exit__ method signature Can suppress exceptions the same way __exit__ methods can. Also accepts any object with an __exit__ method (registering a call to the method instead of the object itself) ( u typeu __exit__u AttributeErroru _exit_callbacksu appendu _push_cm_exit( u selfu exitu _cb_typeu exit_method( ( u/ /opt/alt/python33/lib64/python3.3/contextlib.pyu push� s u ExitStack.pushc s2 � � � f d d � } � | _ | j | � � S( u\ Registers an arbitrary callback and arguments. Cannot suppress exceptions. c s � � � � d S( N( ( u exc_typeu excu tb( u argsu callbacku kwds( u/ /opt/alt/python33/lib64/python3.3/contextlib.pyu _exit_wrapper� s u) ExitStack.callback.<locals>._exit_wrapper( u __wrapped__u push( u selfu callbacku argsu kwdsu _exit_wrapper( ( u argsu callbacku kwdsu/ /opt/alt/python33/lib64/python3.3/contextlib.pyu callback� s u ExitStack.callbackc C s8 t | � } | j } | j | � } | j | | � | S( u� Enters the supplied context manager If successful, also pushes its __exit__ method as a callback and returns the result of the __enter__ method. ( u typeu __exit__u __enter__u _push_cm_exit( u selfu cmu _cm_typeu _exitu result( ( u/ /opt/alt/python33/lib64/python3.3/contextlib.pyu enter_context� s u ExitStack.enter_contextc C s | j d d d � d S( u$ Immediately unwind the context stackN( u __exit__u None( u self( ( u/ /opt/alt/python33/lib64/python3.3/contextlib.pyu close� s u ExitStack.closec C s | S( N( ( u self( ( u/ /opt/alt/python33/lib64/python3.3/contextlib.pyu __enter__� s u ExitStack.__enter__c s | d d k } t j � d � � f d d � } d } d } xy | j r� | j j � } y% | | � r} d } d } d } n WqA t j � } | | d | d � d } | } YqA XqA W| ry | d j } | d � Wqt k r� | | d _ � YqXn | o | S( Ni i c sN x> | j } | | k r d S| d k s4 | � k r8 Pn | } q | | _ d S( N( u __context__u None( u new_excu old_excu exc_context( u frame_exc( u/ /opt/alt/python33/lib64/python3.3/contextlib.pyu _fix_exception_context� s u2 ExitStack.__exit__.<locals>._fix_exception_contextFT( NNN( u Noneu sysu exc_infou Falseu _exit_callbacksu popu Trueu __context__u BaseException( u selfu exc_detailsu received_excu _fix_exception_contextu suppressed_excu pending_raiseu cbu new_exc_detailsu fixed_ctx( ( u frame_excu/ /opt/alt/python33/lib64/python3.3/contextlib.pyu __exit__� s2 u ExitStack.__exit__N( u __name__u __module__u __qualname__u __doc__u __init__u pop_allu _push_cm_exitu pushu callbacku enter_contextu closeu __enter__u __exit__( u __locals__( ( u/ /opt/alt/python33/lib64/python3.3/contextlib.pyu ExitStack� s ( u __doc__u sysu collectionsu dequeu functoolsu wrapsu __all__u objectu ContextDecoratoru _GeneratorContextManageru contextmanageru closingu ExitStack( ( ( u/ /opt/alt/python33/lib64/python3.3/contextlib.pyu <module> s 4 "
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