[issue26915] Test identity first in membership operation of ItemsView, ValuesView and Sequence in collections.abc

[Xiang Zhang]

Xiang Zhang added the comment:

Thanks for review Serhiy and nice thoughts. I make the class inherited directly from Sequence. So if the methods in Sequence are OK, the test class is OK.

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Added file: http://bugs.python.org/file43189/issue26915_v3.patch

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