pythongh-104271: Fix auto() fallback in case of mixed type Enum

itamaro · May 7, 2023 · 09bfba4 · 09bfba4
1 parent 8d95012
commit 09bfba4
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Showing 2 changed files with 5 additions and 2 deletions.
diff --git a/Lib/enum.py b/Lib/enum.py
@@ -1185,7 +1185,7 @@ def _generate_next_value_(name, start, count, last_values):
                     DeprecationWarning,
                     stacklevel=3,
                     )
-            for v in last_values:
+            for v in reversed(last_values):
                 try:
                     return v + 1
                 except TypeError:

diff --git a/Lib/test/test_enum.py b/Lib/test/test_enum.py
@@ -4254,11 +4254,14 @@ class Color(Enum):
                 red = 'red'
                 blue = 2
                 green = auto()
+                yellow = auto()
 
-        self.assertEqual(list(Color), [Color.red, Color.blue, Color.green])
+        self.assertEqual(list(Color),
+                         [Color.red, Color.blue, Color.green, Color.yellow])
         self.assertEqual(Color.red.value, 'red')
         self.assertEqual(Color.blue.value, 2)
         self.assertEqual(Color.green.value, 3)
+        self.assertEqual(Color.yellow.value, 4)
 
     @unittest.skipIf(
             python_version < (3, 13),