import Xlib.XK

mods_to_indexes_x11 = {
        "Shift": Xlib.X.ShiftMapIndex,
        "Lock": Xlib.X.LockMapIndex,
        "Control": Xlib.X.ControlMapIndex,
        "Mod1": Xlib.X.Mod1MapIndex,
        "Mod2": Xlib.X.Mod2MapIndex,
        "Mod3": Xlib.X.Mod3MapIndex,
        "Mod4": Xlib.X.Mod4MapIndex,
        "Mod5": Xlib.X.Mod5MapIndex
    }

if display and mod_name in mods_to_indexes_x11:

    mods = display.get_modifier_mapping()
    first_keycode = mods[mods_to_indexes_x11[mod_name]][0]
    if first_keycode:
        key = EV_KEY.codes[int(first_keycode) - 8]
        keysym = display.keycode_to_keysym(first_keycode, 0)

    	# here
        for key in Xlib.XK.__dict__:
            if key.startswith("XK") and Xlib.XK.__dict__[key] == keysym:
                return key[3:]
        # here