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contextlib.cpython-35.pyc
|g/ @ s d Z d d l Z d d l m Z d d l m Z d d d 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 Z Gd d d e Z Gd d d e Z Gd d d Z Gd d d e Z d S)z4Utilities for with-statement contexts. See PEP 343. N)deque)wrapscontextmanagerclosingContextDecorator ExitStackredirect_stdoutredirect_stderrsuppressc @ s. e Z d Z d Z d d Z d d Z d S)r zJA base class or mixin that enables context managers to work as decorators.c C s | S)a6 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. )selfr r /usr/lib/python3.5/contextlib.py _recreate_cm s z ContextDecorator._recreate_cmc s% t f d d } | S)Nc s% j | | SWd QRXd S)N)r )argskwds)funcr r r inner s z(ContextDecorator.__call__.<locals>.inner)r )r r r r )r r r __call__ s !zContextDecorator.__call__N)__name__ __module__ __qualname____doc__r r r r r r r s c @ sF e Z d Z d Z d d Z d d Z d d Z d d Z d S) _GeneratorContextManagerz%Helper for @contextmanager decorator.c C si | | | | _ | | | | _ | _ | _ t | d d } | d k r\ t | j } | | _ d S)Nr )genr r r getattrtyper )r r r r docr r r __init__% s z!_GeneratorContextManager.__init__c C s | j | j | j | j S)N) __class__r r r )r r r r r 3 s z%_GeneratorContextManager._recreate_cmc C s9 y t | j SWn! t k r4 t d d Yn Xd S)Nzgenerator didn't yield)nextr StopIteration RuntimeError)r r r r __enter__9 s z"_GeneratorContextManager.__enter__c C s | d k rE y t | j Wn t k r5 d SYq Xt d n | d k rZ | } y& | j j | | | t d Wn t k r } z | | k SWYd d } ~ Xn[ t k r } z | j | k r d S WYd d } ~ Xn! t j d | k r Yn Xd S)Nzgenerator didn't stopz#generator didn't stop after throw()F )r r r r! throw __cause__sysexc_info)r r value tracebackexcr r r __exit__? s( z!_GeneratorContextManager.__exit__N)r r r r r r r" r+ r r r r r " s r c s" t f d d } | S)a @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 )r r )r r r helper s z contextmanager.<locals>.helper)r )r r, r )r r r g s c @ s: e Z d Z d Z d d Z d d Z d d Z d S) r a2 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)thing)r r- r r r r s zclosing.__init__c C s | j S)N)r- )r r r r r" s zclosing.__enter__c G s | j j d S)N)r- close)r r' r r r r+ s zclosing.__exit__N)r r r r r r" r+ r r r r r s c @ s: e Z d Z d Z d d Z d d Z d d Z d S)_RedirectStreamNc C s | | _ g | _ d S)N) _new_target _old_targets)r new_targetr r r r s z_RedirectStream.__init__c C s9 | j j t t | j t t | j | j | j S)N)r1 appendr r& _streamsetattrr0 )r r r r r" s z_RedirectStream.__enter__c C s t t | j | j j d S)N)r5 r& r4 r1 pop)r exctypeexcinstexctbr r r r+ s z_RedirectStream.__exit__)r r r r4 r r" r+ r r r r r/ s r/ c @ s e Z d Z d Z d Z d S)r aA Context manager for temporarily redirecting stdout to another file. # How to send help() to stderr with redirect_stdout(sys.stderr): help(dir) # How to write help() to a file with open('help.txt', 'w') as f: with redirect_stdout(f): help(pow) stdoutN)r r r r r4 r r r r r s c @ s e Z d Z d Z d Z d S)r zCContext manager for temporarily redirecting stderr to another file.stderrN)r r r r r4 r r r r r s c @ s: e Z d Z d Z d d Z d d Z d d Z d S) r a? Context manager to suppress specified exceptions After the exception is suppressed, execution proceeds with the next statement following the with statement. with suppress(FileNotFoundError): os.remove(somefile) # Execution still resumes here if the file was already removed c G s | | _ d S)N) _exceptions)r exceptionsr r r r s zsuppress.__init__c C s d S)Nr )r r r r r" s zsuppress.__enter__c C s | d k o t | | j S)N) issubclassr< )r r7 r8 r9 r r r r+ s zsuppress.__exit__N)r r r r r r" r+ r r r r r s c @ s e 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)r a 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)r _exit_callbacks)r r r r r s zExitStack.__init__c C s+ t | } | j | _ t | _ | S)z?Preserve the context stack by transferring it to a new instance)r r? r )r new_stackr r r pop_all s zExitStack.pop_allc s/ f d d } | _ | j | d S)z:Helper to correctly register callbacks to __exit__ methodsc s | S)Nr ) exc_details)cmcm_exitr r _exit_wrapper s z.ExitStack._push_cm_exit.<locals>._exit_wrapperN)__self__push)r rC rD rE r )rC rD r _push_cm_exit s zExitStack._push_cm_exitc C sR t | } y | j } Wn" t k r= | j j | Yn X| j | | | S)a 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) )r r+ AttributeErrorr? r3 rH )r exit_cb_type exit_methodr r r rG s zExitStack.pushc s2 f d d } | _ | j | S)z\Registers an arbitrary callback and arguments. Cannot suppress exceptions. c s d S)Nr )exc_typer* tb)r callbackr r r rE s z)ExitStack.callback.<locals>._exit_wrapper) __wrapped__rG )r rO r r rE r )r rO r r rO s zExitStack.callbackc C s8 t | } | j } | j | } | j | | | S)zEnters the supplied context manager If successful, also pushes its __exit__ method as a callback and returns the result of the __enter__ method. )r r+ r" rH )r rC _cm_type_exitresultr r r enter_context' s zExitStack.enter_contextc C s | j d d d d S)z$Immediately unwind the context stackN)r+ )r r r r r. 4 s zExitStack.closec C s | S)Nr )r r r r r" 8 s zExitStack.__enter__c s | d d k } t j d f d d } d } d } xv | j r | j j } y" | | rz d } d } d } WqA t j } | | d | d d } | } YqA XqA W| r y | d j } | d Wn" t k r | | d _ Yn X| o| S)Nr r# c sL x< | j } | | k r d S| d k s4 | k r5 P| } q W| | _ d S)N) __context__)new_excold_exc exc_context) frame_excr r _fix_exception_contextA s z2ExitStack.__exit__.<locals>._fix_exception_contextFT)NNN)r& r' r? r6 rU BaseException) r rB received_excrZ suppressed_exc pending_raisecbnew_exc_details fixed_ctxr )rY r r+ ; s2 zExitStack.__exit__N) r r r r r rA rH rG rO rT r. r" r+ r r r r r s )r r& collectionsr functoolsr __all__objectr r r r r/ r r r r r r r r <module> s E "