[issue19331] Revise PEP 8 recommendation for class names

[Nick Coghlan]

Nick Coghlan added the comment:

Lots of builtins, collections and itertools use lowercase names as well, as do some older stdlib types (array, mmap, socket).

The only clear dividing lines I can really discern are that ABCs *must* start with a capital, as should classes paired with a separate factory function.

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<http://bugs.python.org/issue19331>
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