[issue9110] contextlib.ContextDecorator

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

> this change is just syntactic sugar for
> any construct of the following form:
>
>  def f():
>    with cm():
>      # Do stuff
>
> ContextDecorator lets you instead write:
>
>  @cm
>  def f():
>    # Do stuff

Nicely expressed.  This ought to go directly into the documentation.

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