[issue18472] Update PEP 8 to encourage modern conventions

[Marc-Andre Lemburg]

Marc-Andre Lemburg added the comment:

> 1. Added an intro paragraph that makes it clear this is a living document, not "set and forget".

If we want to make this a living document, I think the PEP will
have to receive its own internal version number and a history
section at the end explaining the changes (basically what you
just summarized for the patch).

Doing so is important, since companies and tools often reference
PEP 8 in internal coding guidelines and any changes need to
be easily identifiable for readers of those guidelines.

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nosy: +lemburg

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