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MethodType�asynccontextmanager�contextmanager�closing� nullcontext�AbstractContextManager�AbstractAsyncContextManager�AsyncExitStack�ContextDecorator� ExitStack�redirect_stdout�redirect_stderr�suppressc @ s2 e Zd ZdZdd� Zejdd� �Zedd� �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/python3.8/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 krt�|dd�S tS )Nr r )r �_collections_abc�_check_methods�NotImplemented��cls�Cr r r �__subclasshook__ s z'AbstractContextManager.__subclasshook__N)
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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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_GeneratorContextManager to support use as
a decorator via implicit recreation.
This is a private interface just for _GeneratorContextManager.
See issue #11647 for details.
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z%_GeneratorContextManagerBase.__init__N)r& r' r( r) r= r r r r r8 O s r8 c @ s( e Zd ZdZdd� Zdd� Zdd� ZdS ) �_GeneratorContextManagerz%Helper for @contextmanager decorator.c C s | � | j| j| j�S r0 )� __class__r5 r2 r3 r r r r r/ f s z%_GeneratorContextManager._recreate_cmc C s< | ` | `| `z t| j�W S tk
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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.
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 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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|| _ d S r0 ��thing)r rW r r r r= & s zclosing.__init__c C s | j S r0 rV r r r r r ( s zclosing.__enter__c G s | j �� d S r0 )rW �close)r rI r r r r * s zclosing.__exit__N�r& r' r( r) r= r r r r r r r s c @ s( e Zd ZdZdd� Zdd� Zdd� ZdS )�_RedirectStreamNc C s || _ g | _d S r0 )� _new_target� _old_targets)r �
new_targetr r r r= 2 s z_RedirectStream.__init__c C s* | j �tt| j�� tt| j| j� | jS r0 )r\ �appendr: rH �_stream�setattrr[ r r r r r 7 s z_RedirectStream.__enter__c C s t t| j| j�� � d S r0 )r` rH r_ r\ �pop�r �exctype�excinst�exctbr r r r < s z_RedirectStream.__exit__)r& r' r( r_ r= r r r r r r rZ . 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)
�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
After the exception is suppressed, execution proceeds with the next
statement following the with statement.
with suppress(FileNotFoundError):
os.remove(somefile)
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_exit_wrapper} s z8_BaseExitStack._create_cb_wrapper.<locals>._exit_wrapperr �rt r2 r3 ru r rs r �_create_cb_wrapper{ s z!_BaseExitStack._create_cb_wrapperc C s t � | _d S r0 )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; rx r )r � new_stackr r r �pop_all� s
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r0 | �|� Y nX | �||� |S )a Registers a callback with the standard __exit__ method signature.
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z_BaseExitStack.pushc C s( t |�}|j}|�|�}| �||� |S )z�Enters the supplied context manager.
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enter_context� s
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rl 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.
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zExitStack.__exit__c C s | � ddd� dS �z%Immediately unwind the context stack.N)r r r r r rX s zExitStack.closeN)r& r' r( r) r r rX r r r r r � s
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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 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.
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_context0 s
z"AsyncExitStack.enter_async_contextc C sD t |�}z
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r2 | �|d� Y nX | �||� |S )a# Registers a coroutine function with the standard __aexit__ method
signature.
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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_exit< s
z AsyncExitStack.push_async_exitc O s� t | �dkr| ^}}} nV| s&td��nHd|krZ|�d�}| ^}} ddl}|jdtdd� ntdt | �d ��|j|f| �|�}||_|�|d
� |S ) zfRegisters an arbitrary coroutine function and arguments.
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method.FN)r� r| r� r r r r� o s z"AsyncExitStack._push_async_cm_exitc � s | S r0 r r r r r r- u s zAsyncExitStack.__aenter__c � s� |d d k }t �� d � � fdd�}d}d}| jr�| j�� \}}z0|rP||� }n||� I d H }|rnd}d}d}W q, t �� } || d |d � d}| }Y q,X q,|r�z|d j}
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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
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