1.正方形螺旋线的绘制。
(1)利用turtle库绘制一个正方形螺旋线，效果如下图所示。

import turtle

turtle.speed("fastest")
turtle.pensize(2)
for x in range(100):
    turtle.forward(2*x)
    turtle.left(90)

(2)修改上面程序，绘制斜螺旋线，效果如下图所示。

import turtle

turtle.speed("fastest")
turtle.pensize(2)
for x in range(100):
    turtle.forward(2*x)
    turtle.left(91)

(3) 修改上面程序，绘制彩色斜螺旋线，效果如下图所示。

import turtle

turtle.speed("fastest")
turtle.pensize(2)
colors=["red","yellow",'purple','blue']
for x in range(100):
    turtle.pencolor(colors[x%4])
    turtle.forward(2*x)
    turtle.left(91)

4 彩色蟒蛇绘制。对 Python 蟒蛇的每个部分采用不同颜色，绘制一条彩色蟒蛇。

import turtle

def drawSnake(rad, angle, len, neckrad):
    colors = ["purple", "red", "yellow", "pink", "blue"]
    for i in range(len):
        turtle.color(colors[i])
        turtle.circle(rad, angle)
        turtle.circle(-rad, angle)

    turtle.color("green")
    turtle.circle(rad, angle / 2)
    turtle.fd(rad)
    turtle.circle(neckrad + 1, 180)
    turtle.fd(rad * 2 / 3)


def main():
    turtle.setup(1300, 800, 0, 0)
    turtle.penup()
    turtle.goto(-350, 0)
    turtle.pendown()
    pythonsize = 30
    turtle.pensize(pythonsize)
    turtle.seth(-40)
    drawSnake(40, 80, 5,pythonsize / 2)


main()

4.绘制奥运五环图，其中五种颜色分别为蓝色、黑色、红色、黄色和绿色。

import turtle

turtle.pensize(10)

turtle.color("blue")
turtle.penup()
turtle.goto(-110,-25)
turtle.pendown()
turtle.circle(45)

turtle.color("black")
turtle.penup()
turtle.goto(0,-25)
turtle.pendown()
turtle.circle(45)

turtle.color("red")
turtle.penup()
turtle.goto(110,-25)
turtle.pendown()
turtle.circle(45)

turtle.color("yellow")
turtle.penup()
turtle.goto(-55,-75)
turtle.pendown()
turtle.circle(45)

turtle.color("green")
turtle.penup()
turtle.goto(55,-75)
turtle.pendown()
turtle.circle(45)

5.制作一个模拟windows启动界面的文本进度条。

import time
scale=50
print()
for i in range(1,12):
    if i in(1,6,11):
        print("{0: ^50}".format('-'*20))
    else:
        print("{0:>15}{1: ^20}{2: <15}".format('|','|','|'))
print("正在启动windows...".center(scale,'-'))
print()
for i in range(scale+1):
    a='|'*i
    b='.'*(scale-i)
    c=(i/scale)*100
    print("\r[{}{}]{:^3.0f}%".format(a,b,c),end='')
    time.sleep(0.3)
print()
print("\n"+"启动完成！".center(scale,'-'))