python openGL:如何改变网格的颜色？

from OpenGL.GL import *
from OpenGL.GLUT import *
from OpenGL.GLU import *

def draw():
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
    glLoadIdentity()
    
    # 设置网格颜色为红色
    glColor3f(1.0, 0.0, 0.0)
    
    # 绘制网格
    glBegin(GL_LINES)
    for i in range(-5, 6):
        glVertex3f(i, -5, 0)
        glVertex3f(i, 5, 0)
        glVertex3f(-5, i, 0)
        glVertex3f(5, i, 0)
    glEnd()
    
    glFlush()

def main():
    glutInit()
    glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE)
    glutInitWindowSize(400, 400)
    glutCreateWindow(b"OpenGL Window")
    glutDisplayFunc(draw)
    glutMainLoop()

if __name__ == "__main__":
    main()