条件、循环、函数定义 练习

用循环画五角星

from turtle import *
for i in range(5):
    forward(200)
    right(144)

用循环画同心圆

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

用while循环画太阳花

from turtle import *
color('red','yellow')
speed('fastest')
begin_fill()
while True:
    forward(200)
    left(170)
    if abs(pos())<1:
        break
end_fill()
done()

用函数定义画五个五角星

from turtle import *
setup(600,400,0,0)
bgcolor('red')
color('yellow')
fillcolor('yellow')
speed('fastest')
def mark_star(x,y):
    up()
    goto(x,y)
    down()

def draw_star(x,y):
    begin_fill()
    for i in range(5):
        forward(x)
        right(y)
    end_fill()

mark_star(-260,120)
draw_star(120,144)

mark_star(-120,160)
draw_star(40,144)

mark_star(-80,120)
draw_star(40,144)

mark_star(-80,60)
draw_star(40,144)

mark_star(-120,20)
draw_star(40,144)
color('red')

用函数定义画钻石花瓣的太阳花

import turtle

def draw_diamond(brad):
    brad.forward(100)
    brad.right(45)
    brad.forward(100)
    brad.right(135)

def draw_art():
    
    window=turtle.Screen()
    window.bgcolor("red")
    
    brad=turtle.Turtle()
    brad.shape("turtle")
    brad.color("orange")
    brad.speed("fastest")


    for i in range(0,36):
        draw_diamond(brad)
        draw_diamond(brad)
        brad.left(10)

    brad.right(90)
    brad.forward(155)
    brad.color('green')
    brad.forward(145)

    window.exitonclick()

draw_art()