如何在 Python 中使用按位标志

Question

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)

我收到错误：

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

如何在 python 2.7 和 python3 中正确定义一些标志并使用它们？

Answer 1

对于 Python 2，您想使用aenum(Advanced Enum) ¹。如果数值不重要，您可以使用Flag：

from aenum import Flag, auto

class InputTypes(Flag):
    """
    Flags to represent the different kinds of input we
    are acting on from the user
    """
    KEYBOARD = auto()
    MOUSE_BUTTONS = auto()
    MOUSE_MOVE = auto()
    ALL = KEYBOARD | MOUSE_BUTTONS | MOUSE_MOVE

如果这些值很重要（意味着您将使用它们作为整数），请IntFlag改为使用。

^{1声明：我是}Python stdlibEnum、enum34backport和Advanced Enumeration ( aenum)库的作者 。