Issue #25503: Fixed inspect.getdoc() for inherited docstrings of properties.

Original patch by John Mark Vandenberg.

Lib/inspect.py

@@ -527,17 +527,18 @@ def _finddoc(obj):
             cls = self
         else:
             cls = self.__class__
-    elif ismethoddescriptor(obj) or isdatadescriptor(obj):
-        name = obj.__name__
-        cls = obj.__objclass__
-        if getattr(cls, name) is not obj:
-            return None
+    # Should be tested before isdatadescriptor().
     elif isinstance(obj, property):
-        func = f.fget
+        func = obj.fget
         name = func.__name__
         cls = _findclass(func)
         if cls is None or getattr(cls, name) is not obj:
             return None
+    elif ismethoddescriptor(obj) or isdatadescriptor(obj):
+        name = obj.__name__
+        cls = obj.__objclass__
+        if getattr(cls, name) is not obj:
+            return None
     else:
         return None
 

Lib/test/inspect_fodder.py

@@ -45,14 +45,17 @@ class StupidGit:
             self.ex = sys.exc_info()
             self.tr = inspect.trace()
 
+    @property
     def contradiction(self):
         'The automatic gainsaying.'
         pass
 
-# line 48
+# line 53
 class MalodorousPervert(StupidGit):
     def abuse(self, a, b, c):
         pass
+
+    @property
     def contradiction(self):
         pass
 
@@ -64,6 +67,8 @@ class ParrotDroppings:
 class FesteringGob(MalodorousPervert, ParrotDroppings):
     def abuse(self, a, b, c):
         pass
+
+    @property
     def contradiction(self):
         pass
 

Lib/test/test_inspect.py

@@ -393,8 +393,8 @@ class TestRetrievingSourceCode(GetSourceBase):
 
     def test_getsource(self):
         self.assertSourceEqual(git.abuse, 29, 39)
-        self.assertSourceEqual(mod.StupidGit, 21, 50)
-        self.assertSourceEqual(mod.lobbest, 70, 71)
+        self.assertSourceEqual(mod.StupidGit, 21, 51)
+        self.assertSourceEqual(mod.lobbest, 75, 76)
 
     def test_getsourcefile(self):
         self.assertEqual(normcase(inspect.getsourcefile(mod.spam)), modfile)

Misc/ACKS

@@ -1483,6 +1483,7 @@ Lukas Vacek
 Ville Vainio
 Andi Vajda
 Case Van Horsen
+John Mark Vandenberg
 Kyle VanderBeek
 Andrew Vant
 Atul Varma

Misc/NEWS

@@ -63,6 +63,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #25503: Fixed inspect.getdoc() for inherited docstrings of properties.
+  Original patch by John Mark Vandenberg.
+
 - Issue #21827: Fixed textwrap.dedent() for the case when largest common
   whitespace is a substring of smallest leading whitespace.
   Based on patch by Robert Li.