From 32bf3597922ac3f613989582afa2bff43bea8a2f Mon Sep 17 00:00:00 2001 From: Matt Bogosian Date: Thu, 10 Mar 2022 08:42:15 -0600 Subject: bpo-46581: Propagate private vars via _GenericAlias.copy_with (GH-31061) GH-26091 added the _typevar_types and _paramspec_tvars instance variables to _GenericAlias. However, they were not propagated consistently. This commit addresses the most prominent deficiency identified in bpo-46581 (namely their absence from _GenericAlias.copy_with), but there could be others. Co-authored-by: Ken Jin <28750310+Fidget-Spinner@users.noreply.github.com> Co-authored-by: Serhiy Storchaka --- Lib/test/test_typing.py | 21 +++++++++++++++++++++ Lib/typing.py | 13 ++++++------- Misc/ACKS | 1 + .../2022-02-01-11-32-47.bpo-46581.t7Zw65.rst | 2 ++ 4 files changed, 30 insertions(+), 7 deletions(-) create mode 100644 Misc/NEWS.d/next/Library/2022-02-01-11-32-47.bpo-46581.t7Zw65.rst diff --git a/Lib/test/test_typing.py b/Lib/test/test_typing.py index 5c1e907..fc596e4 100644 --- a/Lib/test/test_typing.py +++ b/Lib/test/test_typing.py @@ -5793,6 +5793,27 @@ class ParamSpecTests(BaseTestCase): self.assertEqual(G2[[int, str], float], list[C]) self.assertEqual(G3[[int, str], float], list[C] | int) + def test_paramspec_gets_copied(self): + # bpo-46581 + P = ParamSpec('P') + P2 = ParamSpec('P2') + C1 = Callable[P, int] + self.assertEqual(C1.__parameters__, (P,)) + self.assertEqual(C1[P2].__parameters__, (P2,)) + self.assertEqual(C1[str].__parameters__, ()) + self.assertEqual(C1[str, T].__parameters__, (T,)) + self.assertEqual(C1[Concatenate[str, P2]].__parameters__, (P2,)) + self.assertEqual(C1[Concatenate[T, P2]].__parameters__, (T, P2)) + self.assertEqual(C1[...].__parameters__, ()) + + C2 = Callable[Concatenate[str, P], int] + self.assertEqual(C2.__parameters__, (P,)) + self.assertEqual(C2[P2].__parameters__, (P2,)) + self.assertEqual(C2[str].__parameters__, ()) + self.assertEqual(C2[str, T].__parameters__, (T,)) + self.assertEqual(C2[Concatenate[str, P2]].__parameters__, (P2,)) + self.assertEqual(C2[Concatenate[T, P2]].__parameters__, (T, P2)) + class ConcatenateTests(BaseTestCase): def test_basics(self): diff --git a/Lib/typing.py b/Lib/typing.py index abb8bce..e301556 100644 --- a/Lib/typing.py +++ b/Lib/typing.py @@ -670,7 +670,9 @@ def Concatenate(self, parameters): "ParamSpec variable.") msg = "Concatenate[arg, ...]: each arg must be a type." parameters = (*(_type_check(p, msg) for p in parameters[:-1]), parameters[-1]) - return _ConcatenateGenericAlias(self, parameters) + return _ConcatenateGenericAlias(self, parameters, + _typevar_types=(TypeVar, ParamSpec), + _paramspec_tvars=True) @_SpecialForm @@ -1339,7 +1341,9 @@ class _GenericAlias(_BaseGenericAlias, _root=True): return tuple(new_args) def copy_with(self, args): - return self.__class__(self.__origin__, args, name=self._name, inst=self._inst) + return self.__class__(self.__origin__, args, name=self._name, inst=self._inst, + _typevar_types=self._typevar_types, + _paramspec_tvars=self._paramspec_tvars) def __repr__(self): if self._name: @@ -1548,11 +1552,6 @@ class _LiteralGenericAlias(_GenericAlias, _root=True): class _ConcatenateGenericAlias(_GenericAlias, _root=True): - def __init__(self, *args, **kwargs): - super().__init__(*args, **kwargs, - _typevar_types=(TypeVar, ParamSpec), - _paramspec_tvars=True) - def copy_with(self, params): if isinstance(params[-1], (list, tuple)): return (*params[:-1], *params[-1]) diff --git a/Misc/ACKS b/Misc/ACKS index df851bb..84fcb32 100644 --- a/Misc/ACKS +++ b/Misc/ACKS @@ -190,6 +190,7 @@ Paul Boddie Matthew Boedicker Robin Boerdijk Andra Bogildea +Matt Bogosian Nikolay Bogoychev David Bolen Wouter Bolsterlee diff --git a/Misc/NEWS.d/next/Library/2022-02-01-11-32-47.bpo-46581.t7Zw65.rst b/Misc/NEWS.d/next/Library/2022-02-01-11-32-47.bpo-46581.t7Zw65.rst new file mode 100644 index 0000000..1982c1d --- /dev/null +++ b/Misc/NEWS.d/next/Library/2022-02-01-11-32-47.bpo-46581.t7Zw65.rst @@ -0,0 +1,2 @@ +Brings :class:`ParamSpec` propagation for :class:`GenericAlias` in line with +:class:`Concatenate` (and others). -- cgit v0.12