[docs] [issue22374] Replace contextmanager example and improve explanation

[Berker Peksag]

Berker Peksag added the comment:

We also have swap_attr() and swap_item() helpers in Lib/test/support/__init__.py. I've used a simplified version of swap_attr() in my patch.

Since this is basically a document improvement I removed Python 2.7 from the versions field.

----------
keywords: +patch
nosy: +berker.peksag
stage:  -> patch review
type:  -> enhancement
versions: +Python 3.6 -Python 2.7, Python 3.4
Added file: http://bugs.python.org/file43095/issue22374.diff

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22374>
_______________________________________