bpo-44524: Fix an issue wherein `_GenericAlias._name` was not properly set for specialforms by BvB93 · Pull Request #27614 · python/cpython · GitHub
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bpo-44524: Fix an issue wherein _GenericAlias._name was not properly set for specialforms #27614

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Merged
ambv merged 4 commits into from
Aug 6, 2021
Merged

bpo-44524: Fix an issue wherein _GenericAlias._name was not properly set for specialforms #27614

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6d3d1d3
Fix an issue wherein `_GenericAlias._name` was not properly set for s…
BvB93 Aug 4, 2021
bbdf4db
Add a `NEWS.d` entry
BvB93 Aug 5, 2021
ab3a89f
Apply suggestions from code review
BvB93 Aug 5, 2021
7ec545d
Reorder types in test_special_attrs, add more tests
ambv Aug 6, 2021
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151 changes: 100 additions & 51 deletions Lib/test/test_typing.py
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23 changes: 17 additions & 6 deletions Lib/typing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -461,7 +461,7 @@ class Starship:
be used with isinstance() or issubclass().
"""
item = _type_check(parameters, f'{self} accepts only single type.')
return _GenericAlias(self, (item,))
return _GenericAlias(self, (item,), name="ClassVar")

@_SpecialForm
def Final(self, parameters):
Expand All @@ -482,7 +482,7 @@ class FastConnector(Connection):
There is no runtime checking of these properties.
"""
item = _type_check(parameters, f'{self} accepts only single type.')
return _GenericAlias(self, (item,))
return _GenericAlias(self, (item,), name="Final")

@_SpecialForm
def Union(self, parameters):
Expand Down Expand Up @@ -520,7 +520,12 @@ def Union(self, parameters):
parameters = _remove_dups_flatten(parameters)
if len(parameters) == 1:
return parameters[0]
return _UnionGenericAlias(self, parameters)

if len(parameters) == 2 and type(None) in parameters:
name = "Optional"
else:
name = "Union"
return _UnionGenericAlias(self, parameters, name=name)

@_SpecialForm
def Optional(self, parameters):
Expand Down Expand Up @@ -565,7 +570,7 @@ def open_helper(file: str, mode: MODE) -> str:
except TypeError: # unhashable parameters
pass

return _LiteralGenericAlias(self, parameters)
return _LiteralGenericAlias(self, parameters, name="Literal")


@_SpecialForm
Expand Down Expand Up @@ -604,7 +609,7 @@ def Concatenate(self, parameters):
"ParamSpec variable.")
msg = "Concatenate[arg, ...]: each arg must be a type."
parameters = tuple(_type_check(p, msg) for p in parameters)
return _ConcatenateGenericAlias(self, parameters)
return _ConcatenateGenericAlias(self, parameters, name="Concatenate")


@_SpecialForm
Expand Down Expand Up @@ -652,7 +657,7 @@ def is_str(val: Union[str, float]):
PEP 647 (User-Defined Type Guards).
"""
item = _type_check(parameters, f'{self} accepts only single type.')
return _GenericAlias(self, (item,))
return _GenericAlias(self, (item,), name="TypeGuard")


class ForwardRef(_Final, _root=True):
Expand Down Expand Up @@ -1237,6 +1242,12 @@ def __subclasscheck__(self, cls):
if issubclass(cls, arg):
return True

def __reduce__(self):
func, (origin, args) = super().__reduce__()
if self._name == "Optional":
args = args[1] if args[0] is type(None) else args[0]
return func, (origin, args)
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def _value_and_type_iter(parameters):
return ((p, type(p)) for p in parameters)
Expand Down
2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2021-08-05-18-20-17.bpo-44524.9T1tfe.rst
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