[docs] [issue10434] Document the rules for "public names"

[Nick Coghlan]

Nick Coghlan added the comment:

PEP 8 now covers the developer side of things: http://www.python.org/dev/peps/pep-0008/#public-and-internal-interfaces

A user facing counterpart describing our backwards compatibility policy is still desirable. Updating PEP 5 wouldn't go astray, since that's *supposed* to serve that purpose :)

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nosy: +ncoghlan

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