[SOLVED] How to use bitwise flags in Python

How to use bitwise flags in Python

from enum import Enum

class InputTypes(Enum):
    """
    Flags to represent the different kinds of input we
    are acting on from the user
    """
    KEYBOARD = 0b00000001,
    MOUSE_BUTTONS = 0b00000010,
    MOUSE_MOVE = 0b00000100,
    ALL = 0b11111111


if __name__ == "__main__":
    x = (InputTypes.KEYBOARD | InputTypes.MOUSE_BUTTONS)

I am getting an error:

TypeError: unsupported operand type(s) for |: 'InputTypes' and 'InputTypes'

How do I properly define some flags and use them, in python 2.7 and in python3?

Solution

The Enum base class overrides class variable access to make them return an instance of the subclass itself. If you don't subclass Enum (and remove the commas), your code will not crash.

Note that you can use sets of Enum entries instead of bit maps to obtain the same result using InputTypes(Enum)