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contextlib.cpython-311.pyc
| d Z ddlZddlZddlZddlZddlmZ ddlmZ ddl m Z m Z g dZ G d dej Z G d d ej Z G d d e Z G d de Z G d d Z G d deee Z G d deee Zd Zd Z G d de Z G d de Z G d d e Z G d d e Z G d d e Z G d! d"e Z G d# d$ Z G d% d&e e Z G d' d(e e Z G d) d*ee Z! G d+ d,e Z"dS )-z4Utilities for with-statement contexts. See PEP 343. N)dequewraps) MethodType GenericAlias)asynccontextmanagercontextmanagerclosing nullcontextAbstractContextManagerAbstractAsyncContextManagerAsyncExitStackContextDecorator ExitStackredirect_stdoutredirect_stderrsuppressaclosingchdirc d e Zd ZdZ ee Zd Zej d Z ed Z dS )r z,An abstract base class for context managers.c | S z0Return `self` upon entering the runtime context. selfs //opt/alt/python311/lib/python3.11/contextlib.py __enter__z AbstractContextManager.__enter__ s c dS z9Raise any exception triggered within the runtime context.Nr r exc_type exc_value tracebacks r __exit__z AbstractContextManager.__exit__ s tr c N | t u rt j |dd S t S )Nr r% )r _collections_abc_check_methodsNotImplementedclsCs r __subclasshook__z'AbstractContextManager.__subclasshook__ s) ( ( (#21k:NN N r N) __name__ __module__ __qualname____doc__ classmethodr __class_getitem__r abcabstractmethodr% r- r r r r r ss 66# L11 [ r r c d e Zd ZdZ ee Zd Zej d Z ed Z dS )r z9An abstract base class for asynchronous context managers.c K | S r r r s r __aenter__z&AbstractAsyncContextManager.__aenter__- s r c K dS r r r! s r __aexit__z%AbstractAsyncContextManager.__aexit__1 s tr c N | t u rt j |dd S t S )Nr8 r: )r r' r( r) r* s r r- z,AbstractAsyncContextManager.__subclasshook__6 s3 - - -#21l3>@ @ @ r N) r. r/ r0 r1 r2 r r3 r8 r4 r5 r: r- r r r r r ' ss CC# L11 [ r r c e Zd ZdZd Zd ZdS )r zJA base class or mixin that enables context managers to work as decorators.c | 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 s r _recreate_cmz ContextDecorator._recreate_cmA s r c @ t fd }|S )Nc p 5 | i |cd d d S # 1 swxY w Y d S Nr> argskwdsfuncr s r innerz(ContextDecorator.__call__.<locals>.innerN s ""$$ + +tT*T** + + + + + + + + + + + + + + + + + +s +//r r rF rG s `` r __call__zContextDecorator.__call__M s9 t + + + + + + r Nr. r/ r0 r1 r> rI r r r r r > s8 PP r r c e Zd ZdZd Zd ZdS )AsyncContextDecoratorzPA base class or mixin that enables async context managers to work as decorators.c | S )z-Return a recreated instance of self. r r s r r> z"AsyncContextDecorator._recreate_cmX s r c @ t fd }|S )Nc K 4 d {V | i | d {V cd d d d {V S # 1 d {V swxY w Y d S rA rB rC s r rG z-AsyncContextDecorator.__call__.<locals>.inner^ s ((** 1 1 1 1 1 1 1 1 !T4 04 0 0000000 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1s ? A A r rH s `` r rI z AsyncContextDecorator.__call__] s9 t 1 1 1 1 1 1 r NrJ r r r rL rL U s8 VV r rL c e Zd ZdZd Zd ZdS ) _GeneratorContextManagerBasezBShared functionality for @contextmanager and @asynccontextmanager.c ||i || _ |||c| _ | _ | _ t |dd }|t | j }|| _ d S )Nr1 )genrF rD rE getattrtyper1 )r rF rD rE docs r __init__z%_GeneratorContextManagerBase.__init__h s] 4&&&*.d' 49didIt,, ;t**$C r c N | | j | j | j S rA ) __class__rF rD rE r s r r> z)_GeneratorContextManagerBase._recreate_cmv s ~~diDI>>>r N)r. r/ r0 r1 rW r> r r r rQ rQ e s8 LL ? ? ? ? ?r rQ c e Zd ZdZd Zd ZdS )_GeneratorContextManagerz%Helper for @contextmanager decorator.c t | ` | `| ` t | j S # t $ r t d d w xY wNzgenerator didn't yield)rD rE rF nextrS StopIteration RuntimeErrorr s r r z"_GeneratorContextManager.__enter__ sU Ity$) C>> ! C C C 788d B Cs 7c f |T t | j t d # | j w xY w# t $ r Y dS w xY w| | } | j ||| n# t $ r}||ucY d }~S d }~wt $ rB}||u r ||_ Y d }~dS t |t r|j |u r ||_ Y d }~dS d }~wt $ r}||ur ||_ Y d }~dS d }~ww xY w t d # | j w xY w)Ngenerator didn't stopFz#generator didn't stop after throw()) r^ rS r` closer_ throw __traceback__ isinstance __cause__ BaseExceptionr typvaluer$ excs r r% z!_GeneratorContextManager.__exit__ s ; %TX%&'>???HNN$$$$ ! uu } # sE95555 ( ( ( %''''''' %<<(1C% 55555 um44! ..*3E' 55555 e##$-! uuuuu !"#HIII sh A ( A AA$ B D BD D! C 2%C C D+ C==DD D0N)r. r/ r0 r1 r r% r r r r[ r[ } s= 0/C C C7! 7! 7! 7! 7!r r[ c e Zd ZdZd Zd ZdS ) _AsyncGeneratorContextManagerz*Helper for @asynccontextmanager decorator.c K | ` | `| ` t | j d {V S # t $ r t d d w xY wr] )rD rE rF anextrS StopAsyncIterationr` r s r r8 z(_AsyncGeneratorContextManager.__aenter__ sk Ity$) C tx (((((( (! C C C 788d B Cs $ ?c K |` t | j d {V t d # | j d {V w xY w# t $ r Y dS w xY w| | } | j ||| d {V n# t $ r}||ucY d }~S d }~wt $ rI}||u r ||_ Y d }~dS t |t t f r|j |u r ||_ Y d }~dS d }~wt $ r}||ur ||_ Y d }~dS d }~ww xY w t d # | j d {V w xY w)Nrb Fz$generator didn't stop after athrow()) rp rS r` acloserq athrowre rf r_ rg rh ri s r r: z'_AsyncGeneratorContextManager.__aexit__ s ; ,DHoo%%%%%%%,&'>??? (//++++++++++ & uu } # hooc5)<<<<<<<<<<% ( ( ( %''''''' %<<(1C% 55555 u}6H&IJJ! ..*3E' 55555 e##$-! uuuuu ("#IJJJhoo''''''''''sh A 0 !A A"!A"2"B D B("D ( D 5 C9,C98C99 D DD !D0 0!EN)r. r/ r0 r1 r8 r: r r r rn rn s= 54C C C7( 7( 7( 7( 7(r rn c < t fd }|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 rA )r[ rD rE rF s r helperz contextmanager.<locals>.helper+ s 'dD999r r rF rx s ` r r r s3 6 4[[: : : : [: Mr c < t fd }|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 & t | | S rA )rn rw s r rx z#asynccontextmanager.<locals>.helperL s ,T4>>>r r ry s ` r r r 1 s3 6 4[[? ? ? ? [? Mr c $ e Zd ZdZd Zd Zd 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 || _ d S rA thingr r s r rW zclosing.__init__c r c | j S rA r~ r s r r zclosing.__enter__e s zr c 8 | j d S rA )r rc r exc_infos r r% zclosing.__exit__g s r Nr. r/ r0 r1 rW r r% r r r r r R sK r r c $ e Zd ZdZd Zd Zd ZdS )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 || _ d S rA r~ r s r rW zaclosing.__init__} r r c K | j S rA r~ r s r r8 zaclosing.__aenter__ s zr c H K | j d {V d S rA )r rs r s r r: zaclosing.__aexit__ s2 j !!!!!!!!!!!r N)r. r/ r0 r1 rW r8 r: r r r r r k sK " " " " " "r r c $ e Zd ZdZd Zd Zd ZdS )_RedirectStreamNc " || _ g | _ d S rA ) _new_target _old_targets)r new_targets r rW z_RedirectStream.__init__ s % r c | j t t | j t t | j | j | j S rA )r appendrT sys_streamsetattrr r s r r z_RedirectStream.__enter__ sE dl!;!;<<<T\4#3444 r c j t t | j | j d S rA )r r r r popr exctypeexcinstexctbs r r% z_RedirectStream.__exit__ s+ T\4#4#8#8#:#:;;;;;r )r. r/ r0 r rW r r% r r r r r sF G < < < < <r r 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/ r0 r1 r r r r r r s GGGr r c e Zd ZdZdZdS )r zCContext manager for temporarily redirecting stderr to another file.stderrNr r r r r r s MMGGGr r c $ e Zd ZdZd Zd Zd 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 || _ d S rA ) _exceptions)r exceptionss r rW zsuppress.__init__ s %r c d S rA r r s r r zsuppress.__enter__ r c 4 |d uot || j S rA ) issubclassr r s r r% zsuppress.__exit__ s! d"Lz'4;K'L'LLr Nr r r r r r sP & & & M M M M Mr r c j e Zd ZdZed Zed Zd Zd Zd Z d Z d Z d Z d d Z d S )_BaseExitStackz.A base class for ExitStack and AsyncExitStack.c " t || S rA r cmcm_exits r _create_exit_wrapperz#_BaseExitStack._create_exit_wrapper '2&&&r c fd}|S )Nc i d S rA r r" rl tbrD callbackrE s r _exit_wrapperz8_BaseExitStack._create_cb_wrapper.<locals>._exit_wrapper s Hd #d # # # # #r r r rD rE r s ``` r _create_cb_wrapperz!_BaseExitStack._create_cb_wrapper s. $ $ $ $ $ $ $ r c , t | _ d S rA )r _exit_callbacksr s r rW z_BaseExitStack.__init__ s $ww r c r t | }| j |_ t | _ |S )z@Preserve the context stack by transferring it to a new instance.)rU r r )r new_stacks r pop_allz_BaseExitStack.pop_all s0 DJJLL $($8 ! $ww r c t | } |j }| || n%# t $ r | | Y nw xY 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). )rU r% _push_cm_exitAttributeError_push_exit_callbackr exit_cb_type exit_methods r pushz_BaseExitStack.push su :: 2"+K t[ 1 1 1 1 + + + $ $T * * * * * + s / AAc t | } |j }|j }n/# t $ r" t d|j d|j d dw xY w || }| || |S )zEnters the supplied context manager. If successful, also pushes its __exit__ method as a callback and returns the result of the __enter__ method. '.z6' object does not support the context manager protocolN)rU r r% r TypeErrorr/ r0 r r r r+ _enter_exitresults r enter_contextz _BaseExitStack.enter_context s 2hh S]FLEE S S S H H H1A H H H I INR S S 2u%%% s ,A c ` | j |g|R i |}||_ | | |S )z\Registers an arbitrary callback and arguments. Cannot suppress exceptions. )r __wrapped__r r r rD rE r s r r z_BaseExitStack.callback sI 0/H4HHH4HH %- ! ///r c ^ | || }| |d dS )z;Helper to correctly register callbacks to __exit__ methods.TN)r r r r r r s r r z _BaseExitStack._push_cm_exit s3 11"g>> 55555r Tc > | j ||f d S rA )r r )r r is_syncs r r z"_BaseExitStack._push_exit_callback s$ ##Wh$788888r N)T)r. r/ r0 r1 staticmethodr r rW r r r r r r r r r r r s 88' ' \' \ ' ' ' ( & 6 6 6 9 9 9 9 9 9r r c $ e Zd ZdZd Zd Zd 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 | S rA r r s r r zExitStack.__enter__+ s r c |d d u}t j d fd}d}d}| j rj| j \ }}|sJ || rd}d}d}n6# t j } ||d |d d}|}Y nxY w| j j|r2 |d j } |d # t $ r | |d _ w xY w|o|S )Nr c F | j }|||u rd S |u rn|} || _ d S rA __context__new_excold_exc exc_context frame_excs r _fix_exception_contextz2ExitStack.__exit__.<locals>._fix_exception_context4 M & % 1 &+*@*@F )++% & #*G r FTNNNr r r r r rh ) r exc_details received_excr suppressed_exc pending_raiser cbnew_exc_details fixed_ctxr s @r r% zExitStack.__exit__. sA "1~T1 LNN1% * * * * * " . .2244KGRNN7 .2{# 5%)N$)M"4K ."%,..&&q'9;q>JJJ $ - " . (N 6 !!n$ -6 A* ..s A" "1B"B7 7Cc 4 | ddd dS z%Immediately unwind the context stack.N)r% r s r rc zExitStack.close_ s dD$'''''r N)r. r/ r0 r1 r r% rc r r r r r sL // // //b( ( ( ( (r r c h e Zd ZdZed Zed Zd Zd Zd Z d Z d Z d Z d Z d S ) 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 " t || S rA r r s r _create_async_exit_wrapperz)AsyncExitStack._create_async_exit_wrapperr r r c fd}|S )Nc ( K i d {V d S rA r r s r r z>AsyncExitStack._create_async_cb_wrapper.<locals>._exit_wrapperx s4 (D)D)) ) ) ) ) ) ) ) ) )r r r s ``` r _create_async_cb_wrapperz'AsyncExitStack._create_async_cb_wrapperv s. * * * * * * * r c K t | } |j }|j }n/# t $ r" t d|j d|j d dw xY w || d{V }| || |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. r r zC' object does not support the asynchronous context manager protocolN)rU r8 r: r r r/ r0 _push_async_cm_exitr s r enter_async_contextz"AsyncExitStack.enter_async_context| s 2hh '^FMEE ' ' ' U U U1A U U U "& ' ' vbzz!!!!!! U+++ s " ,Ac t | } |j }| || n&# t $ r | |d Y nw xY 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)rU r: r r r r s r push_async_exitz AsyncExitStack.push_async_exit sw :: 8",K $ $T; 7 7 7 7 2 2 2 $ $T5 1 1 1 1 1 2 s / AAc b | j |g|R i |}||_ | |d |S )zfRegisters an arbitrary coroutine function and arguments. Cannot suppress exceptions. F)r r r r s r push_async_callbackz"AsyncExitStack.push_async_callback sK 65hNNNNNN %- ! 666r c D K | ddd d{V dS r )r: r s r rs zAsyncExitStack.aclose s4 nnT4...........r c ^ | || }| |d dS )zLHelper to correctly register coroutine function to __aexit__ method.FN)r r r s r r z"AsyncExitStack._push_async_cm_exit s5 77GDD 66666r c K | S rA r r s r r8 zAsyncExitStack.__aenter__ s r c K |d d u}t j d fd}d}d}| j rv| j \ }} |r || }n || d {V }|rd}d}d}n6# t j } || d |d d}| }Y nxY w| j v|r2 |d j } |d # t $ r | |d _ w xY w|o|S )Nr r c F | j }|||u rd S |u rn|} || _ d S rA r r s r r z8AsyncExitStack.__aexit__.<locals>._fix_exception_context r r FTr r ) r r r r r r r r cb_suppressr r r s @r r: zAsyncExitStack.__aexit__ si "1~T1 LNN1% * * * * * " . .2244KGR . 9"$"k"2KK(*K(8"8"8"8"8"8"8K 5%)N$)M"4K ."%,..&&q'9;q>JJJ $ - # " .$ (N 6 !!n$ -6 A* ..s A0 01B#0C C N)r. r/ r0 r1 r r r r r r rs r r8 r: r r r r r e s ' ' \' \ $ $ / / /7 7 7 3/ 3/ 3/ 3/ 3/r r c 2 e Zd ZdZddZd Zd Zd Zd 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 || _ d S rA enter_result)r r s r rW znullcontext.__init__ s (r c | j S rA r r s r r znullcontext.__enter__ s r c d S rA r r excinfos r r% znullcontext.__exit__ r r c K | j S rA r r s r r8 znullcontext.__aenter__ s r c K d S rA r r s r r: znullcontext.__aexit__ s r rA ) r. r/ r0 r1 rW r r% r8 r: r r r r r sn ) ) ) )! ! ! ! ! ! r r c $ e Zd ZdZd Zd Zd ZdS )r zHNon thread-safe context manager to change the current working directory.c " || _ g | _ d S rA )path_old_cwd)r r s r rW zchdir.__init__ s r c | j t j t j | j d S rA )r r osgetcwdr r r s r r zchdir.__enter__ s6 RY[[))) r c \ t j | j d S rA )r r r r r s r r% zchdir.__exit__ s& ""$$%%%%%r Nr r r r r r sG RR & & & & &r r )#r1 r4 r r r' collectionsr functoolsr typesr r __all__ABCr r objectr rL rQ r[ rn r r r r r r r r r r r r r r r r <module>r s : : * * * * * * * * SW , #' . v . F ? ? ? ? ? ? ? ?0G! G! G! G! G! G! G! G!RG( G( G( G( G( G( G( G(T B B $ 2" " " " "* " " "4< < < < <, < < <$ o o M M M M M% M M M<Q9 Q9 Q9 Q9 Q9 Q9 Q9 Q9jA( A( A( A( A( 6 A( A( A(JH/ H/ H/ H/ H/^%@ H/ H/ H/V (*E 6 & & & & & " & & & & &r