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bpo-40389: Improve repr of typing.Optional (#19714)

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Vlad Serebrennikov 2020-04-30 04:06:39 +03:00 • committed by GitHub
parent b1e11c31c5
commit 138a9b9c2a
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4 changed files with 10 additions and 2 deletions
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7
Lib/typing.py
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@ -691,6 +691,13 @@ class _GenericAlias(_Final, _root=True):
return _GenericAlias(self.__origin__, params, name=self._name, inst=self._inst)
def __repr__(self):
if (self.__origin__ == Union and len(self.__args__) == 2
and type(None) in self.__args__):
if self.__args__[0] is not type(None):
arg = self.__args__[0]
else:
arg = self.__args__[1]
return (f'typing.Optional[{_type_repr(arg)}]')
if (self._name != 'Callable' or
len(self.__args__) == 2 and self.__args__[0] is Ellipsis):
if self._name: