Read mouse buttons from /dev/input/mice in Python

mousebuttons.py

from enum import Enum, auto
import struct

INPUT_DEVICE = '/dev/input/mice'

class Button(Enum):
    LEFT = auto()
    RIGHT = auto()
    MIDDLE = auto()

codeMap = {
    8: [],
    9: [Button.LEFT],
    10: [Button.RIGHT],
    11: [Button.LEFT, Button.RIGHT],
    12: [Button.MIDDLE],
    13: [Button.LEFT, Button.MIDDLE],
    14: [Button.RIGHT, Button.MIDDLE],
    15: [Button.LEFT, Button.RIGHT, Button.MIDDLE],
}

previousDownButtons = []

with open(INPUT_DEVICE, 'rb') as mousefile:
    while True:
        data = mousefile.read(3);
        mousecode = struct.unpack('3b', data)
        if mousecode[1] != 0 or mousecode[2] != 0:
            continue # Ignore mouse movement
        clickcode = mousecode[0]
        downButtons = codeMap[clickcode]
        for button in list(Button):
            if button in downButtons and button not in previousDownButtons:
                previousDownButtons.append(button)
                print('%s clicked' % button.name) # TODO: Call whatever useful function instead
            if button not in downButtons and button in previousDownButtons:
                previousDownButtons.remove(button)
                print('%s released' % button.name)