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

def mygoto(x,y):
    turtle.up()
    turtle.goto(x,y)
    turtle.down()
    
mygoto(-250,75)

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

运行结果：

2.画同心圆

import turtle

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

运行结果：

3.画太阳花

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

turtle.begin_fill()
while True:
     turtle.forward(200)
     turtle.left(150)
     if(abs(turtle.pos()))<1:
        break
turtle.end_fill()
done()

运行结果：

4.画五个角星

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

def mygoto(x,y):
    turtle.up()
    turtle.goto(x,y)
    turtle.down()
    
mygoto(-250,75)

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

mygoto(-130,150)

turtle.begin_fill()
for i in range(5):
    turtle.forward(40)
    turtle.right(144)
turtle.end_fill()


mygoto(-70,110)

turtle.begin_fill()
for i in range(5):
    turtle.forward(40)
    turtle.right(144)
turtle.end_fill()


mygoto(-80,35)

turtle.begin_fill()
for i in range(5):
    turtle.forward(40)
    turtle.right(144)
turtle.end_fill()

mygoto(-130,-25)

turtle.begin_fill()
for i in range(5):
    turtle.forward(40)
    turtle.right(144)
turtle.end_fill()

运行结果：