KeyboardSpecialFunc无法旋转opengl python

import pygame
from pygame.locals import *
from OpenGL.GL import *
from OpenGL.GLU import *

rotation = 0

def init():
    glClearColor(0.0, 0.0, 0.0, 0.0)
    glClearDepth(1.0)
    glEnable(GL_DEPTH_TEST)
    glDepthFunc(GL_LEQUAL)
    glMatrixMode(GL_PROJECTION)
    gluPerspective(45, 1.0, 0.1, 100.0)
    glMatrixMode(GL_MODELVIEW)

def draw_cube():
    global rotation
    glLoadIdentity()
    glTranslatef(0.0, 0.0, -6.0)
    glRotatef(rotation, 1, 1, 1)
    
    # 绘制一个立方体
    glBegin(GL_QUADS)
    # 绘制各个面
    # ...
    glEnd()

    rotation += 1

def main():
    pygame.init()
    display = (800, 600)
    pygame.display.set_mode(display, DOUBLEBUF | OPENGL)

    init()

    while True:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
                quit()
            elif event.type == pygame.KEYDOWN:
                if event.key == pygame.K_ESCAPE:
                    pygame.quit()
                    quit()

        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
        draw_cube()
        pygame.display.flip()
        pygame.time.wait(10)

if __name__ == "__main__":
    main()