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：

　　1.画五角星

import turtle

turtle.pencolor("red")
turtle.pensize(5)
turtle.fillcolor("yellow")
turtle.begin_fill()
for i in range(5):
    turtle.forward(100)
    turtle.right(144)

turtle.end_fill()
turtle.hideturtle()

 

　　2.画同心圆

import turtle

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

 

　　3.画太阳花

import turtle
turtle.pensize(3)
turtle.pencolor("red")
turtle.fillcolor("yellow")
turtle.begin_fill()
while True:
    turtle.forward(300)
    turtle.left(170)
    if(abs(turtle.pos()))<1:
        break
turtle.end_fill()
turtle.hideturtle()

 

 

　　4.画五个角星

import turtle
turtle.bgcolor('red')

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

def m_draw(r):
    turtle.pencolor('yellow')
    turtle.fillcolor('yellow')
    turtle.begin_fill()
    for i in range(5):
        turtle.forward(r)
        turtle.right(144)
    turtle.end_fill()

m_goto(-350,180)
m_draw(150)


m_goto(-175,250)
turtle.left(50)
m_draw(50)

m_goto(-100,173)
turtle.left(44)
m_draw(50)

m_goto(-70,80)
turtle.left(50)
m_draw(50)

m_goto(-130,50)
turtle.left(50)
m_draw(50)

turtle.hideturtle()
turtle.done()

 

　　5.画◇花瓣的太阳花。

import turtle
turtle.speed(10)
turtle.fillcolor("pink")
turtle.pencolor("red")
turtle.begin_fill()
def draw_leng():
    for i in range(1,3):
        turtle.forward(100)
        turtle.right(45)
        turtle.forward(100)
        turtle.right(135)

for i in range(1,37):
    draw_leng()
    turtle.right(10)
turtle.end_fill()
turtle.right(90)
turtle.forward(300)

turtle.hideturtle()

 附加一个小心心♥~笔芯。

import turtle  

turtle.speed(10)
def xin():
    for i in range(200):
        turtle.right(1)
        turtle.forward(1)
turtle.color('red','pink')        
turtle.begin_fill()
turtle.left(140)
turtle.forward(111.65)
xin()
turtle.left(120)
xin()
turtle.forward(111.65)
turtle.end_fill()
turtle.hideturtle()