[issue18472] Update PEP 8 to encourage modern conventions

[Barry A. Warsaw]

Barry A. Warsaw added the comment:

On Jul 28, 2013, at 09:48 PM, Nick Coghlan wrote:

>
>Nick Coghlan added the comment:
>
>"with statements are good", basically.

`with ExitStack() as stack` is even better :)

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<http://bugs.python.org/issue18472>
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