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-rw-r--r--Lib/copyreg.py6
1 files changed, 5 insertions, 1 deletions
diff --git a/Lib/copyreg.py b/Lib/copyreg.py
index 67f5bb0..cef9984 100644
--- a/Lib/copyreg.py
+++ b/Lib/copyreg.py
@@ -128,7 +128,11 @@ def _slotnames(cls):
continue
# mangled names
elif name.startswith('__') and not name.endswith('__'):
- names.append('_%s%s' % (c.__name__, name))
+ stripped = c.__name__.lstrip('_')
+ if stripped:
+ names.append('_%s%s' % (stripped, name))
+ else:
+ names.append(name)
else:
names.append(name)