John Belmonte <j...@neggie.net> added the comment:
It's completely undocumented, but today I noticed that Flag.__contains__() is
actually a subset operation.
def __contains__(self, other):
...
return other._value_ & self._value_ == other._value_
It's an unfortunate departure from the `set` type, which uses `in` for
membership test and issubset() / `<=` for subset test.
For set operations, the Flag individual bits should be considered the members
of a set (not Flag compound values, which are themselves equivalent to a set).
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38250>
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