然后，加上用键盘控制小球的方向的代码

好的，接下来我来为你添加控制小球方向的代码。

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

vertices = (
    (1, -1, -1),
    (1, 1, -1),
    (-1, 1, -1),
    (-1, -1, -1),
    (1, -1, 1),
    (1, 1, 1),
    (-1, -1, 1),
    (-1, 1, 1)
)

edges = (
    (0, 1),
    (0, 3),
    (0, 4),
    (2, 1),
    (2, 3),
    (2, 7),
    (6, 3),
    (6, 4),
    (6, 7),
    (5, 1),
    (5, 4),
    (5, 7)
)

def Cube():
    glBegin(GL_LINES)
    for edge in edges:
        for vertex in edge:
            glVertex3fv(vertices[vertex])
    glEnd()

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

    gluPerspective(45, (display[0]/display[1]), 0.1, 50.0)

    glTranslatef(0.0,0.0, -5)

    x = 0
    y = 0
    z = 0
    speed = 0.1

    while True:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
                quit()
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LEFT:
                    x = speed
                elif event.key == pygame.K_RIGHT:
                    x = -speed
                elif event.key == pygame.K_UP:
                    y = -speed
                elif event.key == pygame.K_DOWN:
                    y = speed
                elif event.key == pygame.K_w:
                    z = speed
                elif event.key == pygame.K_s:
                    z = -speed
            if event.type == pygame.KEYUP:
                if event.key == pygame.K_LEFT or event.key == pygame.K_RIGHT:
                    x = 0
                elif event.key == pygame.K_UP or event.key == pygame.K_DOWN:
                    y = 0
                elif event.key == pygame.K_w or event.key == pygame.K_s:
                    z = 0

        glTranslatef(x, y, z)

        glRotatef(1, 3, 1, 1)
        glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT)
        Cube()
        pygame.display.flip()
        pygame.time.wait(10)

if __name__ == '__main__':
    main()

在这个代码中，我们添加了一些变量来控制小球的移动速度和方向，然后根据按键事件来改变小球的位置。你可以尝试修改速度值，或者添加其他按键事件来控制小球的运动。