bpo-43744: [Enum] fix ``_is_private`` (GH-25349)
``_is_private`` now returns ``False`` instead of raising an exception when enum name matches beginning of class name
as used in a private variable
diff --git a/Lib/enum.py b/Lib/enum.py
index 9533dd8..17deb4b 100644
--- a/Lib/enum.py
+++ b/Lib/enum.py
@@ -53,10 +53,11 @@ def _is_sunder(name):
def _is_private(cls_name, name):
# do not use `re` as `re` imports `enum`
pattern = '_%s__' % (cls_name, )
+ pat_len = len(pattern)
if (
- len(name) >= 5
+ len(name) > pat_len
and name.startswith(pattern)
- and name[len(pattern)] != '_'
+ and name[pat_len:pat_len+1] != ['_']
and (name[-1] != '_' or name[-2] != '_')
):
return True