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�ZdS )'z4Utilities for with-statement contexts. See PEP 343.� N)�deque)�wraps�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 �//opt/alt/python37/lib64/python3.7/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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__module__� __qualname__�__doc__r �abc�abstractmethodr � classmethodr r r r r r s c @ s2 e Zd ZdZdd� Zejdd� �Zedd� �Z dS ) r z9An abstract base class for asynchronous context managers.c � s | S )z0Return `self` upon entering the runtime context.r )r r r r �
__aenter__& s z&AbstractAsyncContextManager.__aenter__c � s dS )z9Raise any exception triggered within the runtime context.Nr )r 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 r / s z,AbstractAsyncContextManager.__subclasshook__N)
r r r r! r% r" r# r& r$ r r r r r r " s 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.
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z ContextDecorator._recreate_cmc s t � �� �fdd��}|S )Nc s �� � � � | |�S Q R X d S )N)r' )�args�kwds)�funcr r r �innerG s
z(ContextDecorator.__call__.<locals>.inner)r )r r* r+ r )r* r r �__call__F s zContextDecorator.__call__N)r r r r! r' r, r r r r r 7 s c @ s e Zd ZdZdd� ZdS )� _GeneratorContextManagerBasezBShared functionality for @contextmanager and @asynccontextmanager.c C sJ |||�| _ ||| | _| _| _t|dd �}|d kr@t| �j}|| _d S )Nr! )�genr* r( r) �getattr�typer! )r r* r( r) �docr r r �__init__Q s
z%_GeneratorContextManagerBase.__init__N)r r r r! r2 r r r r r- N s r- c @ s( e Zd ZdZdd� Zdd� Zdd� ZdS ) �_GeneratorContextManagerz%Helper for @contextmanager decorator.c C s | � | j| j| j�S )N)� __class__r* r( r) )r r r r r' e s z%_GeneratorContextManager._recreate_cmc C s: | ` | `| `y
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z!_GeneratorContextManager.__exit__N)r r r r! r' r r r r r r r3 ` s r3 c @ s e Zd ZdZdd� Zdd� ZdS )� _AsyncGeneratorContextManagerz Helper for @asynccontextmanager.c � s4 y| j �� I d H S tk
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z'_AsyncGeneratorContextManager.__aexit__N)r r r r! r% r& r r r r r? � s r? 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 )N)r3 )r( r) )r* r r �helper� s z contextmanager.<locals>.helper)r )r* rF r )r* 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 )N)r? )r( r) )r* r r rF s z#asynccontextmanager.<locals>.helper)r )r* rF r )r* 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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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! rN r r r r r
? s c @ s e Zd ZdZdZdS )r zCContext manager for temporarily redirecting stderr to another file.�stderrN)r r r r! rN r r r r r O 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)
# Execution still resumes here if the file was already removed
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dS )�_BaseExitStackz.A base class for ExitStack and AsyncExitStack.c s � �fdd�}|S )Nc s �� | ||�S )Nr )r r> �tb)�cm�cm_exitr r �
_exit_wrapperx s z:_BaseExitStack._create_exit_wrapper.<locals>._exit_wrapperr )r[ r\ r] r )r[ r\ r �_create_exit_wrapperv s z#_BaseExitStack._create_exit_wrapperc s � ^�� � ��fdd�}|S )Nc s �� �� d S )Nr )r r> rZ )r( �callbackr) r r r] s z8_BaseExitStack._create_cb_wrapper.<locals>._exit_wrapperr )r( r) r] r )r( r_ r) r �_create_cb_wrapper| s z!_BaseExitStack._create_cb_wrapperc C s t � | _d S )N)r �_exit_callbacks)r r r r r2 � s z_BaseExitStack.__init__c C s t | �� }| j|_t� | _|S )z@Preserve the context stack by transferring it to a new instance.)r0 ra 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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)r0 r �AttributeError�_push_exit_callback�
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z_BaseExitStack.pushc C s( t |�}|j}|�|�}| �||� |S )z�Enters the supplied context manager.
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returns the result of the __enter__ method.
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z _BaseExitStack.enter_contextc O s| t | �dkr| ^}}} n>| s&td��n0d|krB|�d�}| ^}} ntdt | �d ��|j|f| �|�}||_|�|� |S )z\Registers an arbitrary callback and arguments.
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� zBdescriptor 'callback' of '_BaseExitStack' object needs an argumentr_ z8callback expected at least 1 positional argument, got %dr8 )�len� TypeErrorrP r` � __wrapped__re )r( r) r r_ r] r r r r_ � s
z_BaseExitStack.callbackc C s" | � ||�}||_| �|d� dS )z;Helper to correctly register callbacks to __exit__ methods.TN)r^ �__self__re )r r[ r\ r] r r r rf � s z _BaseExitStack._push_cm_exitTc C s | j �||f� d S )N)ra rM )r r_ �is_syncr r r re � s z"_BaseExitStack._push_exit_callbackN)T)r r r r! � staticmethodr^ r` r2 rc rj rn r_ rf re r r r r rY s s rY 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 )Nr )r r r r r � s zExitStack.__enter__c
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zExitStack.__exit__c C s | � ddd� dS )z%Immediately unwind the context stack.N)r )r r r r rH s zExitStack.closeN)r r r r! r r rH r r r r r � s 1c @ s` e Zd ZdZedd� �Zedd� �Zdd� Zdd � Zd
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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 s � �fdd�}|S )Nc � s �� | ||�I d H S )Nr )r r> rZ )r[ r\ r r r] ' s z@AsyncExitStack._create_async_exit_wrapper.<locals>._exit_wrapperr )r[ r\ r] r )r[ r\ r �_create_async_exit_wrapper% s z)AsyncExitStack._create_async_exit_wrapperc s � ^�� � ��fdd�}|S )Nc � s �� ��I d H d S )Nr )r r> rZ )r( r_ r) r r r] . s z>AsyncExitStack._create_async_cb_wrapper.<locals>._exit_wrapperr )r( r) r] r )r( r_ r) 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)r0 r& r% �_push_async_cm_exit)r r[ rk rl rm r r r �enter_async_context2 s
z"AsyncExitStack.enter_async_contextc C sD t |�}y
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r2 | �|d� Y nX | �||� |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)r0 r& rd re r� )r rg rh ri r r r �push_async_exit> s
z AsyncExitStack.push_async_exitc O s~ t | �dkr| ^}}} n>| s&td��n0d|krB|�d�}| ^}} ntdt | �d ��|j|f| �|�}||_|�|d� |S )zfRegisters an arbitrary coroutine function and arguments.
Cannot suppress exceptions.
ro zMdescriptor 'push_async_callback' of 'AsyncExitStack' object needs an argumentr_ zCpush_async_callback expected at least 1 positional argument, got %dr8 F)rp rq rP r� rr re )r( r) r r_ r] r r r �push_async_callbackP s
z"AsyncExitStack.push_async_callbackc � s | � ddd�I dH dS )z%Immediately unwind the context stack.N)r& )r r r r �aclosei s zAsyncExitStack.aclosec C s" | � ||�}||_| �|d� dS )zLHelper to correctly register coroutine function to __aexit__
method.FN)r� rs re )r r[ r\ r] r r r r� m s z"AsyncExitStack._push_async_cm_exitc � s | S )Nr )r r r r r% t s zAsyncExitStack.__aenter__c � s� |d d k }t �� d � � fdd�}d}d}xx| jr�| j�� \}}y0|rR||� }n||� I d H }|rpd}d}d}W q. t �� } || d |d � d}| }Y q.X q.W |r�y|d j}
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zAsyncExitStack.__aexit__N)r r r r! ru r� r� r� r� r� r� r� r% r& r r r r r
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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
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