Python Standard Library

Module contextlib

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Module contextlib

Utilities for with-statement contexts. See PEP 343.

Classes [hide private]

GeneratorContextManager
Helper for @contextmanager decorator. closing
Context to automatically close something at the end of a block.

Functions [hide private]

contextmanager(func)
@contextmanager decorator.

nested(*args, **kwds)
Support multiple context managers in a single with-statement.

Imports: sys

Function Details [hide private]

contextmanager(func)

@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>

nested(*args, **kwds)

Support multiple context managers in a single with-statement.
Code like this:
 with nested(A, B, C) as (X, Y, Z):
 <body>
is equivalent to this:
 with A as X:
 with B as Y:
 with C as Z:
 <body>

Decorators:

@contextmanager

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Python Standard Library

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