条件、循环、函数定义 练习

太阳花：
import turtle
turtle.bgcolor(‘red‘,‘green‘)
while True:
    turtle.forward(200)
    turtle.left(170)
    if(abs(turtle.pos()))<1:
        break

五个五角星
import turtle
turtle.setup(600,400,0,0)
turtle.color("yellow")
turtle.bgcolor(‘red‘)
turtle.fillcolor("yellow")

def my_goto(x,y):
    turtle.up()
    turtle.goto(x,y)
    turtle.down()

def my_draw5(r):
    turtle.begin_fill()
    for i in range(5):
        turtle.forward(r)
        turtle.right(144)
    turtle.end_fill()

my_goto(-250,75)
my_draw5(100)


my_goto(-100,150)
my_draw5(50)


my_goto(-80,100)
my_draw5(50)


my_goto(-80,50)
my_draw5(50)


my_goto(-100,0)
my_draw5(50)

画一个五角星
import turtle
turtle.color(‘yellow‘)
turtle.begin_fill()
for i in range(5):
turtle.forward(100)
turtle.right(144)
turtle.end_fill()

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

画菱形太阳花
import turtle
def draw_center(brad):
brad.forward(125)
brad.right(45)
brad.forward(100)
brad.right(135)
def draw_flower():
window=turtle.Screen()
window.bgcolor(‘blue‘)
brad=turtle.Turtle()
brad.color(‘yellow‘)
brad.speed(20)
for i in range(1,18):
draw_center(brad)
draw_center(brad)
brad.left(20)
brad.right(70)
brad.forward(325)
window.exitonclick()
draw_flower()
turtle.hideturtle()