Fix isinstance() for Protocols #330
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Fixes #297
This allows to use
isinstance()with classes that inherit from protocols intyping.pysuch asSupportsIntetc.@gvanrossum I was thinking about how protocols should work (including runtime), and now I think that the "quick-fix" that you proposed is actually the right fix for this issue. (Main motivation is that a class that inherits from a protocol should not be considered a protocol itself, unless it lists
Protocolin bases.)Please, take a look.