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contextlib.cpython-39.pyc
a DOg0` @ sZ d Z ddlZddlZddlZddlmZ ddlmZ ddlm Z m Z g dZ G dd dej Z G d d d ej ZG d d d eZG d d dZG dd dee eZG dd deeZdd Zdd ZG dd de ZG dd de ZG dd d eZG d d d eZG d d d e ZG d!d" d"ZG d#d$ d$ee Z G d%d& d&eeZ G d'd( d(e Z dS ))z4Utilities for with-statement contexts. See PEP 343. N)dequewraps) MethodType GenericAlias) asynccontextmanagercontextmanagerclosing nullcontextAbstractContextManagerAbstractAsyncContextManagerAsyncExitStackContextDecorator ExitStackredirect_stdoutredirect_stderrsuppressc @ s: e Zd ZdZeeZdd Zej dd Z edd Z dS ) r z,An abstract base class for context managers.c C s | S z0Return `self` upon entering the runtime context. selfr r "/usr/lib64/python3.9/contextlib.py __enter__ s z AbstractContextManager.__enter__c C s dS z9Raise any exception triggered within the runtime context.Nr r exc_type exc_value tracebackr r r __exit__ s z AbstractContextManager.__exit__c C s | t u rt|ddS tS )Nr r )r _collections_abc_check_methodsNotImplementedclsCr r r __subclasshook__ s z'AbstractContextManager.__subclasshook__N) __name__ __module__ __qualname____doc__ classmethodr __class_getitem__r abcabstractmethodr r% r r r r r s r c @ s: e Zd ZdZeeZdd Zej dd Z edd Z dS ) r z9An abstract base class for asynchronous context managers.c s | S r r r r r r __aenter__+ s z&AbstractAsyncContextManager.__aenter__c s dS r r r r r r __aexit__/ s z%AbstractAsyncContextManager.__aexit__c C s | t u rt|ddS tS )Nr. r/ )r r r r! r" r r r r% 4 s z,AbstractAsyncContextManager.__subclasshook__N) r& r' r( r) r* r r+ r. r, r- r/ r% r r r r r % s r c @ s e Zd ZdZdd Zdd ZdS )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. r r r r r _recreate_cm? s z ContextDecorator._recreate_cmc s t fdd}|S )Nc s: | i |W d S 1 s,0 Y d S N)r0 argskwdsfuncr r r innerL s z(ContextDecorator.__call__.<locals>.innerr )r r6 r7 r r5 r __call__K s zContextDecorator.__call__N)r& r' r( r) r0 r8 r r r r r < s r c @ s e Zd ZdZdd Zdd ZdS ) _GeneratorContextManagerBasezBShared functionality for @contextmanager and @asynccontextmanager.c C sN ||i || _ ||| | _| _| _t|dd }|d u rDt| j}|| _d S )Nr) )genr6 r3 r4 getattrtyper) )r r6 r3 r4 docr r r __init__V s z%_GeneratorContextManagerBase.__init__c C s | | j| j| jS r1 ) __class__r6 r3 r4 r r r r r0 d s z)_GeneratorContextManagerBase._recreate_cmN)r& r' r( r) r> r0 r r r r r9 S s r9 c @ s e Zd ZdZdd Zdd ZdS )_GeneratorContextManagerz%Helper for @contextmanager decorator.c C s: | ` | `| `z t| jW S ty4 tdd Y n0 d S Nzgenerator didn't yield)r3 r4 r6 nextr: StopIteration RuntimeErrorr r r r r r s z"_GeneratorContextManager.__enter__c C s |d u r6zt | j W n ty* Y dS 0 tdn|d u rD| }z| j||| W n ty } z||uW Y d }~S d }~0 ty } zF||u rW Y d }~dS t|tr|j|u rW Y d }~dS W Y d }~n<d }~0 ty } z||u r W Y d }~dS d }~0 0 tdd S )NFgenerator didn't stopz#generator didn't stop after throw())rB r: rC rD throw isinstance __cause__ BaseExceptionr typvaluer excr r r r { s4 z!_GeneratorContextManager.__exit__N)r& r' r( r) r r r r r r r@ k s r@ c @ s e Zd ZdZdd Zdd ZdS ) _AsyncGeneratorContextManagerz*Helper for @asynccontextmanager decorator.c s@ | ` | `| `z| j I d H W S ty: tdd Y n0 d S rA )r3 r4 r6 r: __anext__StopAsyncIterationrD r r r r r. s z(_AsyncGeneratorContextManager.__aenter__c s4 |d u r>z| j I d H W n ty0 Y dS 0 td n|d u rL| }z| j |||I d H W n ty } z||uW Y d }~S d }~0 t y } zJ||u rW Y d }~dS t|ttfr|j|u rW Y d }~dS W Y d }~n<d }~0 ty& } z||ur W Y d }~dS d }~0 0 tdd S )NFrE z$generator didn't stop after athrow()) r: rO rP rD athrowrG rC rH rI rJ r r r r/ s4 z'_AsyncGeneratorContextManager.__aexit__N)r& r' r( r) r. r/ r r r r rN s rN c s t fdd}|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 r1 )r@ r2 r6 r r helper s z contextmanager.<locals>.helperr r6 rS r rR r r s r c s t fdd}|S )a @asynccontextmanager decorator. Typical usage: @asynccontextmanager async def some_async_generator(<arguments>): <setup> try: yield <value> finally: <cleanup> This makes this: async with some_async_generator(<arguments>) as <variable>: <body> equivalent to this: <setup> try: <variable> = <value> <body> finally: <cleanup> c s t | |S r1 )rN r2 rR r r rS & s z#asynccontextmanager.<locals>.helperr rT r rR r r s r c @ s( e Zd ZdZdd Zdd Zdd ZdS ) 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 r1 thing)r rV r r r r> = s zclosing.__init__c C s | j S r1 rU r r r r r ? s zclosing.__enter__c G s | j d S r1 )rV close)r exc_infor r r r A s zclosing.__exit__Nr& r' r( r) r> r r r r r r r , s r c @ s( e Zd ZdZdd Zdd Zdd ZdS )_RedirectStreamNc C s || _ g | _d S r1 ) _new_target _old_targets)r new_targetr r r r> I s z_RedirectStream.__init__c C s* | j tt| j tt| j| j | jS r1 )r\ appendr; sys_streamsetattrr[ r r r r r N s z_RedirectStream.__enter__c C s t t| j| j d S r1 )ra r_ r` r\ popr exctypeexcinstexctbr r r r S s z_RedirectStream.__exit__)r& r' r( r` r> r r r r r r rZ E s rZ c @ s e Zd ZdZdZdS )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) stdoutNr& r' r( r) r` r r r r r W s r c @ s e Zd ZdZdZdS )r zCContext manager for temporarily redirecting stderr to another file.stderrNrh r r r r r g s r c @ s( e Zd ZdZdd Zdd Zdd ZdS ) 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 r1 ) _exceptions)r exceptionsr r r r> x s zsuppress.__init__c C s d S r1 r r r r r r { s zsuppress.__enter__c C s |d uot || jS r1 ) issubclassrj rc r r r r ~ s zsuppress.__exit__NrY r r r r r m s r c @ sb e Zd ZdZedd Zedd Zdd Zdd Zd d Z d d Z dd Z dd Z dddZ dS )_BaseExitStackz.A base class for ExitStack and AsyncExitStack.c C s t || S r1 r cmcm_exitr r r _create_exit_wrapper s z#_BaseExitStack._create_exit_wrapperc s fdd}|S )Nc s i d S r1 r r rM tbr3 callbackr4 r r _exit_wrapper s z8_BaseExitStack._create_cb_wrapper.<locals>._exit_wrapperr rv r3 r4 rw r ru r _create_cb_wrapper s z!_BaseExitStack._create_cb_wrapperc C s t | _d S r1 )r _exit_callbacksr r r r r> s z_BaseExitStack.__init__c C s t | }| j|_t | _|S )z@Preserve the context stack by transferring it to a new instance.)r< rz r )r new_stackr r r pop_all s z_BaseExitStack.pop_allc C s@ t |}z |j}W n ty. | | Y n0 | || |S )a Registers a callback with the standard __exit__ method signature. Can suppress exceptions the same way __exit__ method can. Also accepts any object with an __exit__ method (registering a call to the method instead of the object itself). )r< r AttributeError_push_exit_callback _push_cm_exitr exit_cb_type exit_methodr r r push s z_BaseExitStack.pushc C s( t |}|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 r r rp _cm_type_exitresultr r r enter_context s z _BaseExitStack.enter_contextc O s, | j |g|R i |}||_| | |S )z\Registers an arbitrary callback and arguments. Cannot suppress exceptions. )ry __wrapped__r~ r rv r3 r4 rw r r r rv s z_BaseExitStack.callbackc C s | ||}| |d dS )z;Helper to correctly register callbacks to __exit__ methods.TN)rr r~ r rp rq rw r r r r s z _BaseExitStack._push_cm_exitTc C s | j ||f d S r1 )rz r^ )r rv is_syncr r r r~ s z"_BaseExitStack._push_exit_callbackN)T)r& r' r( r) staticmethodrr ry r> r| r r rv r r~ r r r r rm s rm c @ s( e Zd ZdZdd Zdd Zdd ZdS ) 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 | S r1 r r r r r r s zExitStack.__enter__c s |d d u}t d fdd}d}d}| jr| j \}}|sHJ z|| r^d}d}d}W q, t }||d |d d}|}Y q,0 q,|rz|d j} |d W n ty | |d _ Y n0 |o|S )Nr c s4 | j }|d u s||u rd S | u r$q*|} q || _ d S r1 __context__new_excold_exc exc_context frame_excr r _fix_exception_context s z2ExitStack.__exit__.<locals>._fix_exception_contextFTNNNr_ rX rz rb r rI ) r exc_details received_excr suppressed_exc pending_raiser cbnew_exc_details fixed_ctxr r r r s4 zExitStack.__exit__c C s | ddd dS z%Immediately unwind the context stack.N)r r r r r rW s zExitStack.closeN)r& r' r( r) r r rW r r r r r s 1r c @ s` e Zd ZdZedd Zedd Zdd Zdd Zd d Z d d Z dd Z dd Z dd Z dS )r a Async context manager for dynamic management of a stack of exit callbacks. For example: async with AsyncExitStack() as stack: connections = [await stack.enter_async_context(get_connection()) for i in range(5)] # All opened connections will automatically be released at the # end of the async with statement, even if attempts to open a # connection later in the list raise an exception. c C s t || S r1 rn ro r r r _create_async_exit_wrapper- s z)AsyncExitStack._create_async_exit_wrapperc s fdd}|S )Nc s i I d H d S r1 r rs ru r r rw 3 s z>AsyncExitStack._create_async_cb_wrapper.<locals>._exit_wrapperr rx r ru r _create_async_cb_wrapper1 s z'AsyncExitStack._create_async_cb_wrapperc s. t |}|j}||I dH }| || |S )zEnters the supplied async context manager. If successful, also pushes its __aexit__ method as a callback and returns the result of the __aenter__ method. N)r< r/ r. _push_async_cm_exitr r r r enter_async_context7 s z"AsyncExitStack.enter_async_contextc C sB t |}z |j}W n ty0 | |d Y n0 | || |S )a# Registers a coroutine function with the standard __aexit__ method signature. Can suppress exceptions the same way __aexit__ method can. Also accepts any object with an __aexit__ method (registering a call to the method instead of the object itself). F)r< r/ r} r~ r r r r r push_async_exitC s z AsyncExitStack.push_async_exitc O s. | j |g|R i |}||_| |d |S )zfRegisters an arbitrary coroutine function and arguments. Cannot suppress exceptions. F)r r r~ r r r r push_async_callbackU s z"AsyncExitStack.push_async_callbackc s | dddI dH dS r )r/ r r r r acloseb s zAsyncExitStack.aclosec C s | ||}| |d dS )zLHelper to correctly register coroutine function to __aexit__ method.FN)r r~ r r r r r f s z"AsyncExitStack._push_async_cm_exitc s | S r1 r r r r r r. l s zAsyncExitStack.__aenter__c s |d d u}t d fdd}d}d}| jr| j \}}z0|rP|| }n|| I d H }|rnd}d}d}W q, t } || d |d d}| }Y q,0 q,|rz|d j} |d W n ty | |d _ Y n0 |o|S )Nr r c s4 | j }|d u s||u rd S | u r$q*|} q || _ d S r1 r r r r r r u s z8AsyncExitStack.__aexit__.<locals>._fix_exception_contextFTr r ) r r r r r r r r cb_suppressr r r r r r/ o s8 zAsyncExitStack.__aexit__N)r& r' r( r) r r r r r r r r r. r/ r r r r r s r c @ s* e Zd ZdZd ddZdd Zdd ZdS ) r aO Context manager that does no additional processing. Used as a stand-in for a normal context manager, when a particular block of code is only sometimes used with a normal context manager: cm = optional_cm if condition else nullcontext() with cm: # Perform operation, using optional_cm if condition is True Nc C s || _ d S r1 enter_result)r r r r r r> s znullcontext.__init__c C s | j S r1 r r r r r r s znullcontext.__enter__c G s d S r1 r )r excinfor r r r s znullcontext.__exit__)NrY r r r r r s r ) r) r, r_ r collectionsr functoolsr typesr r __all__ABCr r objectr r9 r@ rN r r r rZ r r r rm r r r r r r r <module> s> A >!! PE