[issue17093] Make importlib.abc more inheritance-friendly

[Brett Cannon]

New submission from Brett Cannon:

ABCs, even though they are almost always at the bottom of an inheritance hierarchy, should still do the right thing in the face of being in the middle of an MRO. That means that they should call super() as appropriate. So for methods that return a value, blindly call super(). For methods that do not necessarily return anything (e.g. invalidate_caches()), check if super() as the method and it is callable and if that is true then make the super() call.

This is not backwards-compatible as it is new semantics people will rely on, but neither is it a bug but a bad design decision on my part.

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components: Library (Lib)
keywords: easy
messages: 181044
nosy: brett.cannon
priority: low
severity: normal
stage: test needed
status: open
title: Make importlib.abc more inheritance-friendly
type: behavior
versions: Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17093>
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