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bpo-28556: Minor fixes for typing module (GH-6732)

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This also fixes https://bugs.python.org/issue33420
This commit is contained in:
Ivan Levkivskyi 2018-05-09 02:23:46 +01:00 • committed by GitHub
parent 0904f766e1
commit 43d12a6bd8
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3 changed files with 79 additions and 2 deletions
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10
Lib/typing.py
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@ -607,7 +607,8 @@ class TypeVar(_Final, _Immutable, _root=True):
# * __parameters__ is a tuple of unique free type parameters of a generic
# type, for example, Dict[T, T].__parameters__ == (T,);
# * __origin__ keeps a reference to a type that was subscripted,
# e.g., Union[T, int].__origin__ == Union;
# e.g., Union[T, int].__origin__ == Union, or the non-generic version of
# the type.
# * __args__ is a tuple of all arguments used in subscripting,
# e.g., Dict[T, int].__args__ == (T, int).
@ -835,7 +836,11 @@ class Generic:
if cls is Generic:
raise TypeError("Type Generic cannot be instantiated; "
"it can be used only as a base class")
return super().__new__(cls)
if super().__new__ is object.__new__:
obj = super().__new__(cls)
else:
obj = super().__new__(cls, *args, **kwds)
return obj
@_tp_cache
def __class_getitem__(cls, params):
@ -1385,6 +1390,7 @@ class NamedTupleMeta(type):
"follow default field(s) {default_names}"
.format(field_name=field_name,
default_names=', '.join(defaults_dict.keys())))
nm_tpl.__new__.__annotations__ = collections.OrderedDict(types)
nm_tpl.__new__.__defaults__ = tuple(defaults)
nm_tpl._field_defaults = defaults_dict
# update from user namespace without overriding special namedtuple attributes