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-rw-r--r--Lib/inspect.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/Lib/inspect.py b/Lib/inspect.py
index c2a32fe..9336943 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -728,7 +728,8 @@ def getclasstree(classes, unique=0):
for parent in c.__bases__:
if not parent in children:
children[parent] = []
- children[parent].append(c)
+ if c not in children[parent]:
+ children[parent].append(c)
if unique and parent in classes: break
elif c not in roots:
roots.append(c)