diff --git a/Lib/enum.py b/Lib/enum.py index 056400d04c9..73dd613887d 100644 --- a/Lib/enum.py +++ b/Lib/enum.py @@ -381,7 +381,7 @@ class EnumMeta(type): # special processing needed for names? if isinstance(names, str): names = names.replace(',', ' ').split() - if isinstance(names, (tuple, list)) and isinstance(names[0], str): + if isinstance(names, (tuple, list)) and names and isinstance(names[0], str): original_names, names = names, [] last_values = [] for count, name in enumerate(original_names): diff --git a/Lib/test/test_enum.py b/Lib/test/test_enum.py index 13a89fc2db6..eaea8ee3abd 100644 --- a/Lib/test/test_enum.py +++ b/Lib/test/test_enum.py @@ -2291,6 +2291,26 @@ class TestIntFlag(unittest.TestCase): self.assertIs(type(e), Perm) + def test_programatic_function_from_empty_list(self): + Perm = enum.IntFlag('Perm', []) + lst = list(Perm) + self.assertEqual(len(lst), len(Perm)) + self.assertEqual(len(Perm), 0, Perm) + Thing = enum.Enum('Thing', []) + lst = list(Thing) + self.assertEqual(len(lst), len(Thing)) + self.assertEqual(len(Thing), 0, Thing) + + + def test_programatic_function_from_empty_tuple(self): + Perm = enum.IntFlag('Perm', ()) + lst = list(Perm) + self.assertEqual(len(lst), len(Perm)) + self.assertEqual(len(Perm), 0, Perm) + Thing = enum.Enum('Thing', ()) + self.assertEqual(len(lst), len(Thing)) + self.assertEqual(len(Thing), 0, Thing) + def test_containment(self): Perm = self.Perm R, W, X = Perm diff --git a/Misc/NEWS b/Misc/NEWS index 371dcf8ff0d..3f5798268fa 100644 --- a/Misc/NEWS +++ b/Misc/NEWS @@ -89,6 +89,9 @@ Core and Builtins Library ------- +- bpo-30616: Functional API of enum allows to create empty enums. + Patched by Dong-hee Na + - bpo-30038: Fix race condition between signal delivery and wakeup file descriptor. Patch by Nathaniel Smith.