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# Module contextlib

source code

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

Imports: sys

Function Details | [hide private]

### contextmanager(func) | source code
    @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) | source code
    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`