3.使用turtle库画渐变的圆

 1 import turtle
 2 a=int(input())
 3 turtle.setup(600,400,500,200)
 4 turtle.pensize(2)
 5 turtle.color("blue")
 6 turtle.fillcolor("yellow")
 7 turtle.begin_fill()
 8 if 3<=a<=9:
 9     
10     turtle.penup()
11     turtle.goto(0,-10)
12     turtle.pendown()
13     turtle.circle(30,steps=a)
14 if a==10:
15     turtle.penup()
16     turtle.goto(0,-10)
17     turtle.pendown()
18     turtle.circle(30)
19 turtle.end_fill()
20 turtle.hideturtle()
21 turtle.done()