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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 �//opt/alt/python38/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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__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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@contextmanager
def some_generator(<arguments>):
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<body>
equivalent to this:
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<cleanup>
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<cleanup>
This makes this:
async with some_async_generator(<arguments>) as <variable>:
<body>
equivalent to this:
<setup>
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finally:
f.close()
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help(pow)
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aO Context manager that does no additional processing.
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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
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