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contextlib.cpython-310.pyc
o ie @ s~ 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 deZG dd dZG dd dee eZG dd deeeZdd Zdd ZG dd de ZG dd d eZG d d d e ZG d d d eZG d!d" d"eZG d#d$ d$e Z G d%d& d&Z G d'd( d(e e Z G d)d* d*e eZ G d+d, d,e eZ dS )-z4Utilities for with-statement contexts. See PEP 343. N)dequewraps) MethodType GenericAlias) asynccontextmanagercontextmanagerclosing nullcontextAbstractContextManagerAbstractAsyncContextManagerAsyncExitStackContextDecorator ExitStackredirect_stdoutredirect_stderrsuppressaclosingc @ : e Zd ZdZeeZdd Zej dd Z edd Z dS ) r z,An abstract base class for context managers.c C | S z0Return `self` upon entering the runtime context. selfr r !/usr/lib/python3.10/contextlib.py __enter__ s z AbstractContextManager.__enter__c C s dS z9Raise any exception triggered within the runtime context.Nr r exc_type exc_value tracebackr r r __exit__ z AbstractContextManager.__exit__c C | t u r t|ddS tS )Nr r! )r _collections_abc_check_methodsNotImplementedclsCr r r __subclasshook__ s z'AbstractContextManager.__subclasshook__N) __name__ __module__ __qualname____doc__ classmethodr __class_getitem__r abcabstractmethodr! r* r r r r r r c @ r ) r z9An abstract base class for asynchronous context managers.c | S r r r r r r __aenter__+ s z&AbstractAsyncContextManager.__aenter__c s dS r r r r r r __aexit__/ s z%AbstractAsyncContextManager.__aexit__c C r# )Nr5 r6 )r r$ r% r& r' r r r r* 4 s z,AbstractAsyncContextManager.__subclasshook__N) r+ r, r- r. r/ r r0 r5 r1 r2 r6 r* r r r r r % r3 r c @ e Zd ZdZdd Zdd ZdS )r zJA base class or mixin that enables context managers to work as decorators.c C r )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 t fdd}|S )Nc s: | i |W d S 1 sw Y d S Nr8 argskwdsfuncr r r innerL s $z(ContextDecorator.__call__.<locals>.innerr r r@ rA r r? r __call__K zContextDecorator.__call__Nr+ r, r- r. r8 rC r r r r r < s r c @ r7 )AsyncContextDecoratorzPA base class or mixin that enables async context managers to work as decorators.c C r )z-Return a recreated instance of self. r r r r r r8 V r" z"AsyncContextDecorator._recreate_cmc r9 )Nc sV 4 I d H | i |I d H W d I d H S 1 I d H s$w Y d S r: r; r< r? r r rA \ s 0z-AsyncContextDecorator.__call__.<locals>.innerr rB r r? r rC [ rD z AsyncContextDecorator.__call__NrE r r r r rF S s rF c @ r7 ) _GeneratorContextManagerBasezBShared functionality for @contextmanager and @asynccontextmanager.c C sN ||i || _ |||| _| _| _t|dd }|d u r"t| j}|| _d S )Nr. )genr@ r= r> getattrtyper. )r r@ r= r> docr r r __init__f s z%_GeneratorContextManagerBase.__init__c C s | | j| j| jS r: ) __class__r@ r= r> r r r r r8 t s z)_GeneratorContextManagerBase._recreate_cmN)r+ r, r- r. rL r8 r r r r rG c s rG c @ r7 )_GeneratorContextManagerz%Helper for @contextmanager decorator.c C s2 | ` | `| `zt| jW S ty tdd w Nzgenerator didn't yield)r= r> r@ nextrH StopIteration RuntimeErrorr r r r r s z"_GeneratorContextManager.__enter__c C s |d u rz t | j W td ty Y dS w |d u r | }z | j||| W td tyC } z ||uW Y d }~S d }~w tyk } z ||u rUW Y d }~dS t|trf|j|u rfW Y d }~dS d }~w ty } z ||urw W Y d }~dS d }~ww )NFgenerator didn't stopz#generator didn't stop after throw())rP rH rQ rR throw isinstance __cause__ BaseExceptionr typvaluer excr r r r! s< z!_GeneratorContextManager.__exit__N)r+ r, r- r. r r! r r r r rN { rN c @ r7 ) _AsyncGeneratorContextManagerz*Helper for @asynccontextmanager decorator.c s: | ` | `| `z t| jI d H W S ty tdd w rO )r= r> r@ anextrH StopAsyncIterationrR r r r r r5 s z(_AsyncGeneratorContextManager.__aenter__c s |d u r z t | jI d H W td ty Y dS w |d u r$| }z| j|||I d H W td tyJ } z ||uW Y d }~S d }~w tyt } z ||u r\W Y d }~dS t|ttfro|j|u roW Y d }~dS d }~w ty } z ||ur W Y d }~dS d }~ww )NFrS z$generator didn't stop after athrow()) r^ rH r_ rR athrowrU rQ rV rW rX r r r r6 s> z'_AsyncGeneratorContextManager.__aexit__N)r+ r, r- r. r5 r6 r r r r r] r\ r] c 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 t | |S r: )rN r< r@ r r helper z contextmanager.<locals>.helperr r@ rd r rc r r r c ra )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 rb r: )r] r< rc r r rd 8 re z#asynccontextmanager.<locals>.helperr rf r rc r r rg r c @ ( 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 || _ d S r: thingr rk r r r rL O zclosing.__init__c C | j S r: rj r r r r r Q zclosing.__enter__c G s | j d S r: )rk closer exc_infor r r r! S s zclosing.__exit__Nr+ r, r- r. rL r r! r r r r r > s r c @ rh ) r a Async context manager for safely finalizing an asynchronously cleaned-up resource such as an async generator, calling its ``aclose()`` method. Code like this: async with aclosing(<module>.fetch(<arguments>)) as agen: <block> is equivalent to this: agen = <module>.fetch(<arguments>) try: <block> finally: await agen.aclose() c C ri r: rj rl r r r rL i rm zaclosing.__init__c | j S r: rj r r r r r5 k zaclosing.__aenter__c s | j I d H d S r: )rk acloserq r r r r6 m s zaclosing.__aexit__N)r+ r, r- r. rL r5 r6 r r r r r W s r c @ s( e Zd ZdZdd Zdd Zdd ZdS )_RedirectStreamNc C s || _ g | _d S r: ) _new_target _old_targets)r new_targetr r r rL u s z_RedirectStream.__init__c C s* | j tt| j tt| j| j | jS r: )ry appendrI sys_streamsetattrrx r r r r r z s z_RedirectStream.__enter__c C s t t| j| j d S r: )r~ r| r} ry popr exctypeexcinstexctbr r r r! s z_RedirectStream.__exit__)r+ r, r- r} rL r r! r r r r rw q s rw c @ 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 s r c @ r )r zCContext manager for temporarily redirecting stderr to another file.stderrNr r r r r r s r c @ rh ) 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 ri r: ) _exceptions)r exceptionsr r r rL rm zsuppress.__init__c C d S r: r r r r r r zsuppress.__enter__c C s |d uo t || jS r: ) issubclassr r r r r r! s zsuppress.__exit__Nrs r r r r r 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 t || S r: r cmcm_exitr r r _create_exit_wrapper z#_BaseExitStack._create_exit_wrapperc fdd}|S )Nc s i d S r: r r r[ tbr= callbackr> r r _exit_wrapper s z8_BaseExitStack._create_cb_wrapper.<locals>._exit_wrapperr r r= r> r r r r _create_cb_wrapper z!_BaseExitStack._create_cb_wrapperc C s t | _d S r: )r _exit_callbacksr r r r rL s z_BaseExitStack.__init__c C s t | }| j|_t | _|S )z@Preserve the context stack by transferring it to a new instance.)rJ r r )r new_stackr r r pop_all s z_BaseExitStack.pop_allc C sB t |}z|j}W n ty | | Y |S w | || |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). )rJ 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. )rJ r! r r r r _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. )r __wrapped__r r r r= r> r r r r r s z_BaseExitStack.callbackc C | ||}| |d dS )z;Helper to correctly register callbacks to __exit__ methods.TN)r r r r r r r r r r s z _BaseExitStack._push_cm_exitTc C s | j ||f d S r: )r r{ )r r is_syncr r r r s z"_BaseExitStack._push_exit_callbackN)T)r+ r, r- r. staticmethodr r rL r r r r r r r r r r r s r c @ rh ) 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 r r: r r r r r r r zExitStack.__enter__c s |d d u}t d fdd}d}d}| jrI| j \}}|s$J z || r/d}d}d}W n t }||d |d d}|}Y | js|rbz |d j} |d tya | |d _ w |oe|S )Nr c 6 | j }|d u s ||u rd S | u rn|} q|| _ d S r: __context__new_excold_exc exc_context frame_excr r _fix_exception_context z2ExitStack.__exit__.<locals>._fix_exception_contextFTNNNr| rr r r r rW ) r exc_details received_excr suppressed_exc pending_raiser cbnew_exc_details fixed_ctxr r r r! s: zExitStack.__exit__c C s | ddd dS z%Immediately unwind the context stack.N)r! r r r r rp F s zExitStack.closeN)r+ r, r- r. r r! rp 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 r r: r r r r r _create_async_exit_wrapperY r z)AsyncExitStack._create_async_exit_wrapperc r )Nc s i I d H d S r: r r r r r r _ s z>AsyncExitStack._create_async_cb_wrapper.<locals>._exit_wrapperr r r r r _create_async_cb_wrapper] r z'AsyncExitStack._create_async_cb_wrapperc s0 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)rJ r6 r5 _push_async_cm_exitr r r r enter_async_contextc s z"AsyncExitStack.enter_async_contextc C sD t |}z|j}W n ty | |d Y |S w | || |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)rJ r6 r r r r r r r push_async_exito 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_callback s z"AsyncExitStack.push_async_callbackc s | dddI dH dS r )r6 r r r r rv s zAsyncExitStack.aclosec C r )zLHelper to correctly register coroutine function to __aexit__ method.FN)r r r r r r r s z"AsyncExitStack._push_async_cm_exitc r4 r: r r r r r r5 zAsyncExitStack.__aenter__c s |d d u}t d fdd}d}d}| jrR| j \}}z|r)|| }n|| I d H }|r8d}d}d}W n t } || d |d d}| }Y | js|rkz |d j} |d tyj | |d _ w |on|S )Nr r c r r: r r r r r r r z8AsyncExitStack.__aexit__.<locals>._fix_exception_contextFTr r ) r r r r r r r r cb_suppressr r r r r r6 s@ zAsyncExitStack.__aexit__N)r+ r, r- r. r r r r r r rv r r5 r6 r r r r r L s r c @ s: e Zd ZdZd ddZdd Zdd Zd d Zd d 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 ri r: enter_result)r r r r r rL rm znullcontext.__init__c C rn r: r r r r r r ro znullcontext.__enter__c G r r: r r excinfor r r r! r znullcontext.__exit__c rt r: r r r r r r5 ru znullcontext.__aenter__c s d S r: r r r r r r6 r znullcontext.__aexit__r: ) r+ r, r- r. rL r r! r5 r6 r r r r r s r )!r. r1 r| r$ collectionsr functoolsr typesr r __all__ABCr r objectr rF rG rN r] r r r r rw r r r r r r r r r r r <module> sH @A!! PE