whats_left prints inherited but unimplemented attrs

tests/generator/not_impl_methods_footer.txt

@@ -1,12 +1,26 @@
-not_implemented = [(name, method)
-                   for name, (val, methods) in expected_methods.items()
-                   for method in methods
-                   if not hasattr(val, method)]
 
-for r in not_implemented:
-    print(r[0], ".", r[1], sep="")
-if not not_implemented:
+def attr_is_not_inherited(type_, attr):
+    """
+    returns True if type_'s attr is not inherited from any of its base classes
+    """
+    bases = type_.__mro__[1:]
+
+    return getattr(type_, attr) not in (getattr(base, attr, None) for base in bases)
+
+
+not_implementeds = []
+for name, (typ, methods) in expected_methods.items():
+    for method in methods:
+        has_method = hasattr(typ, method)
+        is_inherited = has_method and not attr_is_not_inherited(typ, method)
+        if has_method and not is_inherited:
+            continue
+        not_implementeds.append((name, method, is_inherited))
+
+for r in not_implementeds:
+    print(r[0], ".", r[1], " (inherited)" if r[2] else "", sep="")
+if not not_implementeds:
     print("Not much \\o/")
 
 if platform.python_implementation() == "CPython":
-    assert len(not_implemented) == 0, "CPython should have all the methods"
+    assert len(not_implementeds) == 0, "CPython should have all the methods"