import turtle
class MyRectangle:
   def __init__(self,x,y,width,height):
      self.__x = x
      self.__y = y
      self.__width = width
      self.__height = height
      MyRectangle.GetValue(self,x,y,width,height)
   def GetValue(self,x,y,width,height):
      if (x == 0) and (y == 0) and (width == 0) and (height == 0):
         self.__x = 0
         self.__y = 0
         self.__width = 100
         self.__height = 100
   def getArea(self):
      print('面积为:{0}'.format(self.__width * self.__height))
   def gerPerimater(self):
      print('周长为:{0}：'.format((self.__width * 2) + (self.__height * 2)))
   def Draw(self):
      t = turtle.Pen()
      t.write('这是原点，开始绘制')
      t.penup()
      t.goto(self.__x,self.__y)
      t.pendown()
      t.goto(self.__x+self.__width,self.__y )
      t.goto(self.__x+self.__width,self.__y- self.__height)
      t.goto(self.__x,self.__y - self.__height)
      t.goto(self.__x,self.__y )
      t.write('绘制完毕')
      turtle.done()
mr = MyRectangle(100,100,200,200)
mr.getArea()
mr.gerPerimater()
mr.Draw()

绘制结果为：

 

import turtle
class MyRectangle:
   def __init__(self,x,y,width,height):
      self.__x = x
      self.__y = y
      self.__width = width
      self.__height = height
      MyRectangle.GetValue(self,x,y,width,height)
   def GetValue(self,x,y,width,height):
      if (x == 0) and (y == 0) and (width == 0) and (height == 0):
         self.__x = 0
         self.__y = 0
         self.__width = 100
         self.__height = 100
   def getArea(self):
      print('面积为:{0}'.format(self.__width * self.__height))
   def gerPerimater(self):
      print('周长为:{0}：'.format((self.__width * 2) + (self.__height * 2)))
   def Draw(self):
      t = turtle.Pen()
      t.write('这是原点，开始绘制')
      t.penup()
      t.goto(self.__x,self.__y)
      t.pendown()
      t.goto(self.__x+self.__width,self.__y )
      t.goto(self.__x+self.__width,self.__y- self.__height)
      t.goto(self.__x,self.__y - self.__height)
      t.goto(self.__x,self.__y )
      t.write('绘制完毕')
      turtle.done()
mr = MyRectangle(0,0,0,0)
mr.getArea()
mr.gerPerimater()
mr.Draw()

默认的输出为：