From: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com>
Date: Wed, 25 May 2022 17:50:24 +0000 (-0700)
Subject: [3.11] gh-93035: [Enum] Fix IntFlag crash when no single-bit members (GH-93076) ... 
X-Git-Tag: v3.11.0b2~18
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=37a7f1b0997466bb088df82f5fe35fe6d1cebb22;p=thirdparty%2FPython%2Fcpython.git

[3.11] gh-93035: [Enum] Fix IntFlag crash when no single-bit members (GH-93076) (GH-93197)

`EnumType` attempts to create a custom docstring for each enum/flag, but that was failing with pathological flags that had no members (only multi-bit aliases).
(cherry picked from commit 08cfc3dabf0f81a4494cd0d697befc7d0dec77b7)

Co-authored-by: Tobin Yehle <tobinyehle@gmail.com>
---

diff --git a/Lib/enum.py b/Lib/enum.py
index 31923d757f80..4a21226f0193 100644
--- a/Lib/enum.py
+++ b/Lib/enum.py
@@ -538,7 +538,7 @@ class EnumType(type):
         #
         # create a default docstring if one has not been provided
         if enum_class.__doc__ is None:
-            if not member_names:
+            if not member_names or not list(enum_class):
                 enum_class.__doc__ = classdict['__doc__'] = _dedent("""\
                         Create a collection of name/value pairs.