给Python海龟画图模块的Turtle类增加自定义方法

"""
   给Python海龟画图模块的Turtle类增加自定义方法
"""
from turtle import Turtle

addx = lambda self,dx:self.setx(self.xcor()+dx)
Turtle.addx = addx

addy = lambda self,dy:self.sety(self.ycor()+dy)
Turtle.addy = addy

tom = Turtle(shape='turtle')

for _ in range(10):
    tom.addx(100)
    tom.addx(-100)
    tom.addy(-10)
tom.addx(100)
tom.addy(100)

tom.screen.mainloop()