python学习（2）

悠悠 2022-05-25 02:09 138阅读 0赞

Python程序设计语言第二版课后答案

P55.3画一个9环同心圆

#e3.tongxinyuan.py
    import turtle
    #draw first circle
    turtle.penup()
    turtle.goto(0,-90)
    turtle.pendown()
    turtle.circle(90)
    #draw second circle
    turtle.penup()
    turtle.goto(0,-80)
    turtle.pendown()
    turtle.circle(80)
    #draw third circle
    turtle.penup()
    turtle.goto(0,-70)
    turtle.pendown()
    turtle.circle(70)
    #draw fourth circle
    turtle.penup()
    turtle.goto(0,-60)
    turtle.pendown()
    turtle.circle(60)
    #draw fifth circle
    turtle.penup()
    turtle.goto(0,-50)
    turtle.pendown()
    turtle.circle(50)
    #draw sixth circle
    turtle.penup()
    turtle.goto(0,-40)
    turtle.pendown()
    turtle.circle(40)
    #draw seven circle
    turtle.penup()
    turtle.goto(0,-30)
    turtle.pendown()
    turtle.circle(30)
    #draw eigth circle
    turtle.penup()
    turtle.goto(0,-20)
    turtle.pendown()
    turtle.circle(20)
    #draw nineth circle
    turtle.penup()
    turtle.goto(0,-10)
    turtle.pendown()
    turtle.circle(10)

P56、程序练习题

2.2

Money=input("请输入带有符号的货币：")
    if Money[-1] in ['$']:
        R=6*eval(Money[0:-1])
        print("转换后得到的人民币为：￥{:.2f}".format(R))
    elif Money[-1] in ["￥"]:
        D=eval(Money[0:-1])/6
        print("转换后得到的美元为：${:.2f}".format(D))
    else:
        print("输入格式错误")

2.4

from turtle import *
    setup(700,400,100,100)
    penup()
    fd(0)
    pendown()
    pensize(5)
    for i in range(3):
        pencolor("#EE82EE")
        seth(i*120)
        fd(200)

2.5

from turtle import *
    setup(700,500,100,100)
    penup()
    fd(0)
    pendown()
    pensize(5)
    pencolor("#FFD700")
    for i in range(3):
        seth(i*120)
        fd(200)
    pencolor("#000000")
    fd(200)
    seth(0)
    pencolor("#BEBEBE")
    fd(400)
    seth(120)
    pencolor("#EE82EE")
    fd(200)
    seth(-120)
    pencolor("#006400")
    fd(200)
    seth(120)
    pencolor("#A020F0")
    fd(200)
    seth(120)

2.6

from turtle import *
    #setup(650,250,200,400)
    penup()
    fd(0)
    pendown()
    pensize(5)
    pencolor("#FFD700")
    for i in range(4):
        penup()
        fd(50)
        left(90)
        fd(50)
        pendown()
        fd(50)

2.7

from turtle import *
    penup()
    fd(0)
    pendown()
    pensize(5)
    pencolor("red")
    seth(30)
    fd(300)
    pencolor("yellow")
    seth(270)
    fd(300)
    pencolor("blue")
    seth(150)
    fd(300)
    pencolor("red")
    seth(30)
    fd(100)
    pencolor("gold")
    seth(90)
    fd(100)
    pencolor("green")
    seth(330)
    fd(300)
    pencolor("purple")
    seth(210)
    fd(300)
    pencolor("violet")
    seth(90)
    fd(200)
    '''angle=(30,30,30,270,270,270,150,150,150,30,90,330,330,330,210,210,210,90,90)
    for i in range(19):
        seth(angle[i])
        fd(100)
    '''

2.8

from turtle import *
    penup()
    pendown()
    speed("fastest")
    pensize(5)
    length=5
    color=("black","blue","gold","green")
    for i in range(20):
        for j in range(4):
            pencolor(color[j])
            fd(length)
            left(90)
            length=length+5