turtle實作水滴、風車形狀

import turtle

turtle.tracer(0)
colors = ["yellow",'blue','red','green']

for i in range(100):
    turtle.color(colors[i%4])
    turtle.pu()
    turtle.forward(i*2)
    turtle.pd()
    turtle.left(89)
    turtle.color(colors[i % 4])
    turtle.begin_fill()
    turtle.circle(-i)
    turtle.end_fill()

turtle.done()