条件、循环、函数定义 练习

1.注意标准库的两种导入与使用方式，建议大家采用<库名>.<函数名>的方式。

2.对前面的代码进行优化，用for,while,if,def实现：

a.画五角星

 

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

 

b.画同心圆

import turtle
turtle.speed(10)
for i in range(6):
    turtle.color('purple')
    turtle.up()
    turtle.goto(0,-20*(i+1))
    turtle.down()
    turtle.circle(20*(i+1))
turtle.hideturtle()

 c.画太阳花

import turtle

turtle.color('red','yellow')
turtle.speed(10)
turtle.begin_fill()
while True:
    turtle.forward(200)
    turtle.left(170)
    if(abs(turtle.pos()))<1:
        break
turtle.end_fill()
turtle.hideturtle()
done()

 

d.画五个角星

法1：

import turtle
turtle.setup(600,400,0,0)
turtle.color('yellow')
turtle.bgcolor('red')
turtle.fillcolor('yellow')
turtle.speed(10)

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

def jzx_draw5(r):
    turtle.begin_fill()
    for i in range(5):
        turtle.forward(r)
        turtle.right(144)
    turtle.end_fill()

jzx_goto(-250,75)
jzx_draw5(100)

jzx_goto(-120,150)
jzx_draw5(50)

jzx_goto(-80,100)
jzx_draw5(50)

jzx_goto(-90,30)
jzx_draw5(50)

jzx_goto(-140,0)
jzx_draw5(50)

turtle.hideturtle()
turtle.done()

 法2：

import turtle
turtle.setup(600,400,0,0)
turtle.color('yellow')
turtle.bgcolor('red')
turtle.fillcolor('yellow')
turtle.speed(10)

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

jzx_goto(-250,75)
turtle.begin_fill()
for i in range(5):
    turtle.forward(100)
    turtle.right(144)
turtle.end_fill()

turtle.up()
turtle.goto(-120,150)
turtle.down()

turtle.begin_fill()
for i in range(5):
    turtle.forward(50)
    turtle.right(144)
turtle.end_fill()

jzx_goto(-80,100)
turtle.begin_fill()
for i in range(5):
    turtle.forward(50)
    turtle.right(144)
turtle.end_fill()

jzx_goto(-90,30)
turtle.begin_fill()
for i in range(5):
    turtle.forward(50)
    turtle.right(144)
turtle.end_fill()

jzx_goto(-140,0)
turtle.begin_fill()
for i in range(5):
    turtle.forward(50)
    turtle.right(144)
turtle.end_fill()
turtle.hideturtle()
turtle.done()

 

e.画◇花瓣的太阳花。

 

import turtle
turtle.fillcolor('yellow')
turtle.bgcolor('white')
turtle.speed(10)
turtle.begin_fill()
for i in range(1,37):
    turtle.forward(100)
    turtle.right(45)
    turtle.forward(100)
    turtle.right(135)
    turtle.forward(100)
    turtle.right(45)
    turtle.forward(100)
    turtle.right(135)
    turtle.left(10)
turtle.end_fill()
turtle.begin_fill()
turtle.right(90)
turtle.forward(300)
turtle.hideturtle()
turtle.end_fill()