--- /Users/tkomiya/.pyenv/versions/3.9.1/lib/python3.9/inspect.py.orig	2021-02-03 23:53:51.000000000 +0900
+++ /Users/tkomiya/.pyenv/versions/3.9.1/lib/python3.9/inspect.py	2021-02-04 00:01:22.000000000 +0900
@@ -2023,13 +2023,22 @@
     invalid = object()
 
     module = None
-    module_dict = {}
+    globals_list = []
+    if isclass(obj):
+        for base in getmro(obj):
+            module_name = getattr(base, '__module__', None)
+            if module_name:
+                module = sys.modules.get(module_name, None)
+                if module:
+                    globals_list.append(module.__dict__)
+    else:
     module_name = getattr(obj, '__module__', None)
     if module_name:
         module = sys.modules.get(module_name, None)
         if module:
-            module_dict = module.__dict__
-    sys_module_dict = sys.modules.copy()
+                globals_list.append(module.__dict__)
+
+    globals_list.append(sys.modules.copy())
 
     def parse_name(node):
         assert isinstance(node, ast.arg)
@@ -2038,12 +2047,13 @@
         return node.arg
 
     def wrap_value(s):
+        for globalns in globals_list:
         try:
-            value = eval(s, module_dict)
-        except NameError:
-            try:
-                value = eval(s, sys_module_dict)
+                value = eval(s, globalns)
+                break
             except NameError:
+                pass
+        else:
                 raise RuntimeError()
 
         if isinstance(value, (str, int, float, bytes, bool, type(None))):