Arseny Boykov <[email protected]> added the comment:
Also, do we need to leave compatibility with python <3.8?
If not, we could use the fact that python 3.8 dicts and sets which are preserve
order to speed things up even more. Also I'd replace % string formatting with
f-strings, as they also faster.
And another thing to think about: maybe we can calculate values returned by
__str__, __repr__ and __invert__ once on member creation, since they not
supposed to change during its life?
For example __invert__ on Flag does a lot of work on every call:
def __invert__(self):
cls = self.__class__
members, uncovered = _decompose(cls, self._value_)
inverted = cls(0)
for m in cls:
if m not in members and not (m._value_ & self._value_):
inverted = inverted | m
return cls(inverted)
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<https://bugs.python.org/issue39102>
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