Python 3 convenience class for checking if a value is a valid Enum value

enum_ex.py

#!/usr/bin/env python3

from enum import EnumMeta, Enum


class EnumExMeta(EnumMeta):
    def __contains__(self, val):
        try:
            self(val)
        except ValueError:
            return False
        return True


class EnumEx(Enum, metaclass=EnumExMeta):
    """
    Derive from this class instead of Enum to use the "in" operator
    """
    pass