bpo-41907: [Enum] fix format() behavior for IntFlag (GH-22497)
diff --git a/Lib/enum.py b/Lib/enum.py
index d670ad7..484db2c 100644
--- a/Lib/enum.py
+++ b/Lib/enum.py
@@ -658,7 +658,7 @@ def __format__(self, format_spec):
# the value
# pure Enum branch, or branch with __str__ explicitly overridden
- str_overridden = type(self).__str__ != Enum.__str__
+ str_overridden = type(self).__str__ not in (Enum.__str__, Flag.__str__)
if self._member_type_ is object or str_overridden:
cls = str
val = str(self)