Restore support for `typing.ParamSpec` (#12581)

CHANGES.rst

@@ -18,6 +18,8 @@ Bugs fixed
 
 * Fix invalid HTML when a rubric node with invalid ``heading-level`` is used.
   Patch by Adam Turner.
+* #12579, #12581: Restore support for ``typing.ParamSpec`` in autodoc.
+  Patch by Adam Turner.
 
 Testing
 -------

sphinx/util/typing.py

@@ -212,7 +212,11 @@ def _is_unpack_form(obj: Any) -> bool:
 
 def _typing_internal_name(obj: Any) -> str | None:
     if sys.version_info[:2] >= (3, 10):
-        return obj.__name__
+        try:
+            return obj.__name__
+        except AttributeError:
+            # e.g. ParamSpecArgs, ParamSpecKwargs
+            return ''
     return getattr(obj, '_name', None)
 
 
@@ -237,7 +241,7 @@ def restify(cls: Any, mode: _RestifyMode = 'fully-qualified-except-typing') -> s
         raise ValueError(msg)
 
     # things that are not types
-    if cls in {None, NoneType}:
+    if cls is None or cls == NoneType:
         return ':py:obj:`None`'
     if cls is Ellipsis:
         return '...'
@@ -388,7 +392,7 @@ def stringify_annotation(
         raise ValueError(msg)
 
     # things that are not types
-    if annotation in {None, NoneType}:
+    if annotation is None or annotation == NoneType:
         return 'None'
     if annotation is Ellipsis:
         return '...'

tests/test_util/test_util_typing.py

@@ -385,6 +385,21 @@ def test_restify_mock():
         assert restify(unknown.secret.Class, "smart") == ':py:class:`~unknown.secret.Class`'
 
 
+@pytest.mark.xfail(sys.version_info[:2] <= (3, 9), reason='ParamSpec not supported in Python 3.9.')
+def test_restify_type_hints_paramspec():
+    from typing import ParamSpec
+    P = ParamSpec('P')
+
+    assert restify(P) == ":py:obj:`tests.test_util.test_util_typing.P`"
+    assert restify(P, "smart") == ":py:obj:`~tests.test_util.test_util_typing.P`"
+
+    assert restify(P.args) == "P.args"
+    assert restify(P.args, "smart") == "P.args"
+
+    assert restify(P.kwargs) == "P.kwargs"
+    assert restify(P.kwargs, "smart") == "P.kwargs"
+
+
 def test_stringify_annotation():
     assert stringify_annotation(int, 'fully-qualified-except-typing') == "int"
     assert stringify_annotation(int, "smart") == "int"
@@ -722,3 +737,21 @@ def test_stringify_type_ForwardRef():
     assert stringify_annotation(Tuple[dict[ForwardRef("MyInt"), str], list[List[int]]]) == "Tuple[dict[MyInt, str], list[List[int]]]"  # type: ignore[attr-defined]
     assert stringify_annotation(Tuple[dict[ForwardRef("MyInt"), str], list[List[int]]], 'fully-qualified-except-typing') == "Tuple[dict[MyInt, str], list[List[int]]]"  # type: ignore[attr-defined]
     assert stringify_annotation(Tuple[dict[ForwardRef("MyInt"), str], list[List[int]]], 'smart') == "~typing.Tuple[dict[MyInt, str], list[~typing.List[int]]]"  # type: ignore[attr-defined]
+
+
+@pytest.mark.xfail(sys.version_info[:2] <= (3, 9), reason='ParamSpec not supported in Python 3.9.')
+def test_stringify_type_hints_paramspec():
+    from typing import ParamSpec
+    P = ParamSpec('P')
+
+    assert stringify_annotation(P, 'fully-qualified') == "~P"
+    assert stringify_annotation(P, 'fully-qualified-except-typing') == "~P"
+    assert stringify_annotation(P, "smart") == "~P"
+
+    assert stringify_annotation(P.args, 'fully-qualified') == "typing.~P"
+    assert stringify_annotation(P.args, 'fully-qualified-except-typing') == "~P"
+    assert stringify_annotation(P.args, "smart") == "~typing.~P"
+
+    assert stringify_annotation(P.kwargs, 'fully-qualified') == "typing.~P"
+    assert stringify_annotation(P.kwargs, 'fully-qualified-except-typing') == "~P"
+    assert stringify_annotation(P.kwargs, "smart") == "~typing.~P"