本文共 2091 字，大约阅读时间需要 6 分钟。

1.正方形螺旋线的绘制。

import turtleturtle.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 turtleturtle.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 turtleturtle.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 turtledef 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 turtleturtle.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 timescale=50print()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,'-'))

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