#11917 - Fix rendering of inherited members for Python 3.9 (#11919)

Co-authored-by: j-carson <j-carson@fastmail.com>
Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>

CHANGES.rst

@@ -72,6 +72,8 @@ Bugs fixed
   Patch by Colin Marquardt.
 * #11598: Do not use query components in URLs for assets in EPUB rendering.
   Patch by David Runge.
+* #11917: Fix rendering of annotated inherited members for Python 3.9.
+  Patch by Janet Carson.
 * #11925: Blacklist the ``sphinxprettysearchresults`` extension; the functionality
   it provides was merged into Sphinx v2.0.0.
   Patch by James Addison.

sphinx/util/inspect.py

@@ -87,7 +87,13 @@ def getall(obj: Any) -> Sequence[str] | None:
 
 def getannotations(obj: Any) -> Mapping[str, Any]:
     """Get __annotations__ from given *obj* safely."""
-    __annotations__ = safe_getattr(obj, '__annotations__', None)
+    if sys.version_info >= (3, 10, 0) or not isinstance(obj, type):
+        __annotations__ = safe_getattr(obj, '__annotations__', None)
+    else:
+        # Workaround for bugfix not available until python 3.10 as recommended by docs
+        # https://docs.python.org/3.10/howto/annotations.html#accessing-the-annotations-dict-of-an-object-in-python-3-9-and-older
+        __dict__ = safe_getattr(obj, '__dict__', {})
+        __annotations__ = __dict__.get('__annotations__', None)
     if isinstance(__annotations__, Mapping):
         return __annotations__
     else:

tests/roots/test-ext-autodoc/target/inherited_annotations.py

@@ -0,0 +1,17 @@
+"""
+    Test case for #11387 corner case involving inherited
+    members with type annotations on python 3.9 and earlier
+"""
+
+class HasTypeAnnotatedMember:
+    inherit_me: int
+    """Inherited"""
+
+class NoTypeAnnotation(HasTypeAnnotatedMember):
+    a = 1
+    """Local"""
+
+class NoTypeAnnotation2(HasTypeAnnotatedMember):
+    a = 1
+    """Local"""
+

tests/test_extensions/test_ext_autodoc_autoclass.py

@@ -515,3 +515,49 @@ def test_autoattribute_TypeVar_module_level(app):
         "   alias of TypeVar('T1')",
         '',
     ]
+
+
+@pytest.mark.sphinx('html', testroot='ext-autodoc')
+def test_inherited_instance_variable_with_annotations(app):
+    options = {'members': None,
+               'inherited-members': None}
+    actual = do_autodoc(app, 'class', 'target.inherited_annotations.NoTypeAnnotation', options)
+    assert list(actual) == [
+        '',
+        '.. py:class:: NoTypeAnnotation()',
+        '   :module: target.inherited_annotations',
+        '',
+        '',
+        '   .. py:attribute:: NoTypeAnnotation.a',
+        '      :module: target.inherited_annotations',
+        '      :value: 1',
+        '',
+        '      Local',
+        '',
+        '',
+        '   .. py:attribute:: NoTypeAnnotation.inherit_me',
+        '      :module: target.inherited_annotations',
+        '      :type: int',
+        '',
+        '      Inherited',
+        '',
+    ]
+
+
+@pytest.mark.sphinx('html', testroot='ext-autodoc')
+def test_no_inherited_instance_variable_with_annotations(app):
+    options = {'members': None}
+    actual = do_autodoc(app, 'class', 'target.inherited_annotations.NoTypeAnnotation2', options)
+    assert list(actual) == [
+        '',
+        '.. py:class:: NoTypeAnnotation2()',
+        '   :module: target.inherited_annotations',
+        '',
+        '',
+        '   .. py:attribute:: NoTypeAnnotation2.a',
+        '      :module: target.inherited_annotations',
+        '      :value: 1',
+        '',
+        '      Local',
+        '',
+    ]