[issue17352] Be clear that __prepare__ must be declared as a static method

[Nick Coghlan]

New submission from Nick Coghlan:

The docs on __prepare__ don't make it clear that it should be a staticmethod, and the error message if you forget is not obvious at all. (This is particularly so, since the examples in PEP 3115 had it as an ordinary method).

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messages: 183463
nosy: ncoghlan
priority: normal
severity: normal
status: open
title: Be clear that __prepare__ must be declared as a static method

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17352>
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