[3.7] bpo-29577: Enum: mixin classes don't mix well with already mixed Enums (GH-9328) (GH-9486)
* bpo-29577: allow multiple mixin classes
diff --git a/Doc/library/enum.rst b/Doc/library/enum.rst
index a6aa863..81e9766 100644
--- a/Doc/library/enum.rst
+++ b/Doc/library/enum.rst
@@ -387,10 +387,17 @@
methods. See `Planet`_ for an example.
-Restricted subclassing of enumerations
---------------------------------------
+Restricted Enum subclassing
+---------------------------
-Subclassing an enumeration is allowed only if the enumeration does not define
+A new :class:`Enum` class must have one base Enum class, up to one concrete
+data type, and as many :class:`object`-based mixin classes as needed. The
+order of these base classes is::
+
+ def EnumName([mix-in, ...,] [data-type,] base-enum):
+ pass
+
+Also, subclassing an enumeration is allowed only if the enumeration does not define
any members. So this is forbidden::
>>> class MoreColor(Color):