问我想两次使用object a类，但是没有实现

EN

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

class Draw:
   # def draw_func(self):
   #     pass

    def draw(self):
        glutInit(sys.argv)
        glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB)
        glutInitWindowSize(1000,1000)
        glutInitWindowPosition(50,50)
        glutCreateWindow(b'Cycle')
        glutDisplayFunc(self.draw_func)
        glClearColor(0,0,0,1)
        gluOrtho2D(-500,500,-500,100)
        glutMainLoop()

class Circle(Draw):
   def __init__(self,xv,yv):
      self.xv=xv
      self.yv= yv

   def draw_circle(self):
      glClear(GL_COLOR_BUFFER_BIT)
      glColor3f(1, 0, 0)
      glPointSize(3)
    for t in arange(self.xv, self.yv, 0.001):
        x = 50 * sin(t)
        y = 50 * cos(t)
        glBegin(GL_POINTS)
        glVertex2f(x, y)
        glEnd()
        glFlush()

   def draw_func(self):
      self.draw_circle()

cycle = Circle(100,200)
cycle.draw()
cycle = Circle(220,300)
cycle.draw()