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

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

Lib/test/test_enum.py

@@ -3395,6 +3395,31 @@ class TestUnique(unittest.TestCase):
             triple = 3
             value = 4
 
+class TestHelpers(unittest.TestCase):
+
+    sunder_names = '_bad_', '_good_', '_what_ho_'
+    dunder_names = '__mal__', '__bien__', '__que_que__'
+    private_names = '_MyEnum__private', '_MyEnum__still_private'
+    private_and_sunder_names = '_MyEnum__private_', '_MyEnum__also_private_'
+    random_names = 'okay', '_semi_private', '_weird__', '_MyEnum__'
+
+    def test_sunder(self):
+        for name in self.sunder_names + self.private_and_sunder_names:
+            self.assertTrue(enum._is_sunder(name), '%r is a not sunder name?' % name)
+        for name in self.dunder_names + self.private_names + self.random_names:
+            self.assertFalse(enum._is_sunder(name), '%r is a sunder name?' % name)
+
+    def test_dunder(self):
+        for name in self.dunder_names:
+            self.assertTrue(enum._is_dunder(name), '%r is a not dunder name?' % name)
+        for name in self.sunder_names + self.private_names + self.private_and_sunder_names + self.random_names:
+            self.assertFalse(enum._is_dunder(name), '%r is a dunder name?' % name)
+
+    def test_is_private(self):
+        for name in self.private_names + self.private_and_sunder_names:
+            self.assertTrue(enum._is_private('MyEnum', name), '%r is a not private name?')
+        for name in self.sunder_names + self.dunder_names + self.random_names:
+            self.assertFalse(enum._is_private('MyEnum', name), '%r is a private name?')
 
 class TestEnumTypeSubclassing(unittest.TestCase):
     pass

Misc/NEWS.d/next/Library/2021-04-11-20-52-32.bpo-43744.uf0E68.rst

@@ -0,0 +1,2 @@
+fix issue with enum member name matching the start of a private variable
+name