Tin mới
This module provides utilities for common tasks involving the with statement. For more information see also Context Manager Types and With Statement Context Managers.
With Statement Context Managers
This module provides utilities for common tasks involving the with statement. For more information see also Context Manager Types and With Statement Context Managers.
An abstract base class for classes that implement __enter__() and __exit__(). A default implementation for __enter__() is provided which returns self while __exit__() is an abstract method which by default returns None.
Most types managing resources support the context manager protocol, which closes thing on leaving the with statement. As such, closing() is most useful for third party types that don’t support context managers. This exam
Return a context manager that suppresses any of the specified exceptions if they occur in the body of a with statement and then resumes execution with the first statement following the end of the with statement.
Supporting a variable number of context managers¶
The primary use case for ExitStack is the one given in the class documentation: supporting a variable number of context managers and other cleanup operations in a single with statement. The variability may come from the
More sophisticated context managers may be “reentrant”. These context managers can not only be used in multiple with statements, but may also be used inside a with statement that is already using the same context manager
More sophisticated context managers may be “reentrant”. These context managers can not only be used in multiple with statements, but may also be used inside a with statement that is already using the same context manager