条件、循环、函数定义 练习

1.画五角星

 

import turtle
for i in range(5):
    turtle.forward(100);
    turtle.right(144);

运行结果：

2.画同心圆

from turtle import*
for i in range(5):
    up()
    goto(0,-20*(i+1))
    down()
    circle(20*(i+1))

运行结果：

3.画太阳花

from turtle import*

while True:
    forward(200)
    left(170)
    if (abs(pos()))<1:
        break
done()

运行结果为：

4.画五个五角星

import turtle
turtle.color('yellow')
turtle.bgcolor('red')

def DrawStar(x,y,a,b):
    turtle.begin_fill()
    turtle.up()
    turtle.goto(x,y)
    for i in range(5):

        turtle.forward(a)
        turtle.right(b)
    turtle.end_fill()

DrawStar(-250,75,150,144)
DrawStar(-100,150,50,144)
DrawStar(-80,80,50,144)
DrawStar(-75,23,50,144)
DrawStar(-100,-35,50,144)

 运行结果为：