diff options
Diffstat (limited to 'Lib/abc.py')
| -rw-r--r-- | Lib/abc.py | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/Lib/abc.py b/Lib/abc.py index 685702909c..1ce38a81c8 100644 --- a/Lib/abc.py +++ b/Lib/abc.py @@ -188,7 +188,7 @@ class ABCMeta(type): cls._abc_negative_cache.add(subclass) return ok # Check if it's a direct subclass - if cls in subclass.__mro__: + if cls in getattr(subclass, '__mro__', ()): cls._abc_cache.add(subclass) return True # Check if it's a subclass of a registered class (recursive) |