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c @ s2 e Zd ZdZdd� Zejdd� �Zedd� �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 krt�|dd�S tS )Nr- r. )r r r r! r" r r r r% 0 s
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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.
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z!_GeneratorContextManager.__exit__N)r& r' r( r) r/ r r r r r r r> a s r> c @ s e Zd ZdZdd� Zdd� ZdS )� _AsyncGeneratorContextManagerz Helper for @asynccontextmanager.c � s6 z| j �� I d H W S tk
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z'_AsyncGeneratorContextManager.__aexit__N)r& r' r( r) r- r. r r r r rL � s rL c s t � �� fdd��}|S )a� @contextmanager decorator.
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@contextmanager
def some_generator(<arguments>):
<setup>
try:
yield <value>
finally:
<cleanup>
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with some_generator(<arguments>) as <variable>:
<body>
equivalent to this:
<setup>
try:
<variable> = <value>
<body>
finally:
<cleanup>
c s t � | |�S r0 )r> r1 �r5 r r �helper� s z contextmanager.<locals>.helperr �r5 rT r rS r r � s 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 r0 )rL r1 rS r r rT s z#asynccontextmanager.<locals>.helperr rU r rS r r � s 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()
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with redirect_stdout(sys.stderr):
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with open('help.txt', 'w') as f:
with redirect_stdout(f):
help(pow)
�stdoutN�r& r' r( r) r_ r r r r r @ s c @ s e Zd ZdZdZdS )r zCContext manager for temporarily redirecting stderr to another file.�stderrNrg r r r r r P s c @ s( e Zd ZdZdd� Zdd� Zdd� ZdS ) r a? Context manager to suppress specified exceptions
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r0 | �|� Y nX | �||� |S )a Registers a callback with the standard __exit__ method signature.
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callbacks.
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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 r0 r rm r r r �_create_async_exit_wrapper& s z)AsyncExitStack._create_async_exit_wrapperc s � ��fdd�}|S )Nc � s �� ��I d H d S r0 r rq rs r r ru , s z>AsyncExitStack._create_async_cb_wrapper.<locals>._exit_wrapperr rv r rs r �_create_async_cb_wrapper* s z'AsyncExitStack._create_async_cb_wrapperc � s. t |�}|j}|�|�I dH }| �||� |S )z�Enters the supplied async context manager.
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r2 | �|d� Y nX | �||� |S )a# Registers a coroutine function with the standard __aexit__ method
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aO Context manager that does no additional processing.
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cm = optional_cm if condition else nullcontext()
with cm:
# Perform operation, using optional_cm if condition is True
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