New submission from Dutcho <[email protected]>:
While `enum.IntFlag.__and__` accepts an int arg `other` and converts it to
`IntFlag` before masking, `enum.IntFlag.__contains__` handles an int arg
`other` no different from a different type arg `other` (i.e. returns `True` in
Python 3.6 due to issue 33217, but would raise `TypeError` after that's fixed):
>>> import enum
>>> ABC = enum.Flag('ABC', 'a, b, c')
>>> ac = ABC.a | ABC.c
>>> ABC.b in ac # works
False
>>> 2 in ac # should be the same; no exception due to issue 33217
True
>>> ac & 3 # works, equivalent to ac & ABC(3)
<ABC.a: 1>
This is caused by a lack of specialized `IntFlag.__contains__`, so
`Flag.__contains__` does the work. Can be fixed by adding a specialization,
which (like in `IntFlag.__and__`) tests for `isinstance(other, (IntFlag, int))`.
>>> def __contains__(self, other):
... if not isinstance(other, (self.__class__, int)):
... return TypeError
... return other & self == other # conversion of int to IntFlag
implicitly handled by IntFlag.__and__
>>> IntFlag.__contains__ = __contains__
----------
components: Library (Lib)
messages: 314893
nosy: Dutcho
priority: normal
severity: normal
status: open
title: x in IntFlag() should test int x's inclusion in IntFlag
type: enhancement
versions: Python 3.6
_______________________________________
Python tracker <[email protected]>
<https://bugs.python.org/issue33219>
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