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Title: bpo-30969: Fix docs about the comparison in absence of __contains__ by ztane · Pull Request #2761 · python/cpython · GitHub

Open Graph Title: bpo-30969: Fix docs about the comparison in absence of __contains__ by ztane · Pull Request #2761 · python/cpython

X Title: bpo-30969: Fix docs about the comparison in absence of __contains__ by ztane · Pull Request #2761 · python/cpython

Description: The documentation doesn't match the implementation, which clearly does x is y or x == y to check if x is the element y from a container. Both the __iter__ and the index-iteration method test the elements using is first. While the document says that x is x means that x == x should be true, it is not true for example in the case of nan: >>> x == x False >>> x is x True``` The following demonstrates the behaviour that is against the documented behaviour: ```>>> class Foo: ... def __iter__(self): ... return iter([x]) ... >>> x in Foo() True >>> any(x == i for i in Foo()) False >>> class Bar: ... def __getitem__(self): ... return [x].__getitem__(self) ... >>> class Bar: ... def __getitem__(self, i): ... return [x].__getitem__(i) ... >>> x in Bar Traceback (most recent call last): File "", line 1, in TypeError: argument of type 'type' is not iterable >>> x in Bar() True >>> any(x == i for i in Bar()) False``` https://bugs.python.org/issue30969

Open Graph Description: The documentation doesn't match the implementation, which clearly does x is y or x == y to check if x is the element y from a container. Both the __iter__ and the index-iteration method test th...

X Description: The documentation doesn't match the implementation, which clearly does x is y or x == y to check if x is the element y from a container. Both the __iter__ and the index-iteration method tes...

Opengraph URL: https://github.com/python/cpython/pull/2761

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