Python程式設計語言第二版課後答案

P55.3畫一個9環同心圓

#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、程式練習題

2.2

Money=input("請輸入帶有符號的貨幣：")
if Money[-1] in ['$']:
    R=6*eval(Money[0:-1])
    print("轉換後得到的人民幣為：￥{:.2f}".format(R))
elif Money[-1] in ["￥"]:
    D=eval(Money[0:-1])/6
    print("轉換後得到的美元為：${:.2f}".format(D))
else:
    print("輸入格式錯誤")

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