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

turtle.begin_fill()
for i in range(5):
    turtle.forward(100)
    turtle.right(144)
turtle.end_fill()

turtle.hideturtle()
turtle.done（）

2.画同心圆

from turtle   import*

bgcolor('pink')
shape('turtle')
color('blue')


for i in range(5):
    up()
    goto(0,-10*(i+1))
    down()
    circle(10*(i+1))

hideturtle()
done（）

 

3.画太阳花

from turtle   import*

speed(100)
shape('turtle')
color('red', 'yellow')

begin_fill()
while True:
    forward(300)
    left(230)
    if abs(pos())<1:
        break
end_fill()
hideturtle()
done

 

4.画五个五角星

import turtle
turtle.speed(100)
turtle.bgcolor('red')
turtle.color('yellow')
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(-300,200)
my_draw5(100)


my_goto(-150,280)
turtle.left(50)
my_draw5(30)

my_goto(-100,220)
turtle.left(50)
my_draw5(30)

my_goto(-85,155)
turtle.left(50)
my_draw5(30)

my_goto(-120,110)
turtle.left(50)
my_draw5(30)

turtle.hideturtle()
turtle.done()

 

5.画◇花瓣的太阳花。

import turtle
turtle.speed(100)
turtle.fillcolor("blue")
turtle.pencolor("yellow")
turtle.begin_fill()
def draw_l():
    for i in range(1,3):
        turtle.forward(150)
        turtle.right(45)
        turtle.forward(150)
        turtle.right(135)

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

turtle.hideturtle()