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bpo-38250: minor Flag refactor by belm0 · Pull Request #22734 · python/cpython · GitHub

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bpo-38250: minor Flag refactor #22734

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bpo-38250: minor Flag refactor #22734

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872b06b
clarify _decompose() calls
belm0 Oct 14, 2020
b86aa8e
Flag.__invert__() cleanup
belm0 Oct 15, 2020
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16 changes: 8 additions & 8 deletions Lib/enum.py
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Original file line number Diff line number Diff line change
Expand Up @@ -776,6 +776,7 @@ def _create_pseudo_member_(cls, value):
pseudo_member = cls._value2member_map_.setdefault(value, pseudo_member)
return pseudo_member

# TODO: document that Flag `in` is a subset operation
def __contains__(self, other):
if not isinstance(other, self.__class__):
raise TypeError(
Expand All @@ -784,14 +785,14 @@ def __contains__(self, other):
return other._value_ & self._value_ == other._value_

def __iter__(self):
members, extra_flags = _decompose(self.__class__, self.value)
members, _ = _decompose(self.__class__, self.value)
return (m for m in members if m._value_ != 0)

def __repr__(self):
cls = self.__class__
if self._name_ is not None:
return '<%s.%s: %r>' % (cls.__name__, self._name_, self._value_)
members, uncovered = _decompose(cls, self._value_)
members, _ = _decompose(cls, self._value_)
return '<%s.%s: %r>' % (
cls.__name__,
'|'.join([str(m._name_ or m._value_) for m in members]),
Expand All @@ -802,7 +803,7 @@ def __str__(self):
cls = self.__class__
if self._name_ is not None:
return '%s.%s' % (cls.__name__, self._name_)
members, uncovered = _decompose(cls, self._value_)
members, _ = _decompose(cls, self._value_)
if len(members) == 1 and members[0]._name_ is None:
return '%s.%r' % (cls.__name__, members[0]._value_)
else:
Expand Down Expand Up @@ -830,12 +831,12 @@ def __xor__(self, other):
return self.__class__(self._value_ ^ other._value_)

def __invert__(self):
members, uncovered = _decompose(self.__class__, self._value_)
members, _ = _decompose(self.__class__, self._value_)
inverted = self.__class__(0)
for m in self.__class__:
if m not in members and not (m._value_ & self._value_):
inverted = inverted | m
return self.__class__(inverted)
inverted |= m
return inverted


class IntFlag(int, Flag):
Expand Down Expand Up @@ -899,8 +900,7 @@ def __xor__(self, other):
__rxor__ = __xor__

def __invert__(self):
result = self.__class__(~self._value_)
return result
return self.__class__(~self._value_)


def _high_bit(value):
Expand Down
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