[docs] [issue23987] docs about containers membership testing wrong for broken objects

[Ethan Furman]

Ethan Furman added the comment:

So something like:

For container types such as list, tuple, or collections.deque, the expression 'x in y' is equivalent to 'any(x is e or x == e for e in y)'.  For container types such as set, frozenset, and dict, this equivalence expression is modified by the addition of 'if hash(x) == hash(e)'.

?

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<http://bugs.python.org/issue23987>
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