《python语言程序设计基础》嵩天著-第2章程序练习题答案

练习题代码

正在看书自学中，贴出自己的作业，欢迎大家交流指正，一起进步～

2.1 实例1的修改

# TempConvert
def TempConvert(value):    
    if tempstr[-1] in ['F','f']:
        c = (eval(tempstr[0:-1]) - 32)/1.8
        print ("The temperature is converted to {}C".format(int(c)))
    elif tempstr[-1] in ['C','c']:
        f = eval(tempstr[0:-1])*1.8 + 32
        print("The temperature is converted to {}F".format(int(f)))
    else:
        print("Input wrong!")
    
tempstr = input("pls input the temperature with unit F or C: ")
while tempstr[-1] not in ['N','n']:
    TempConvert(tempstr)
    tempstr = input("pls input the temperature with unit F or C: ")

2.2 汇率兑换

# Exchange rate conversion
while True:
    try:
        s=input('输入金额以¥或$结尾,输入E结束: ')
        mode = s[-1]
        if mode=='E':
            break
        elif mode=='$':
            print(str(6*int(s[:-1]))+'¥')
        else:
            print(str(round(int(s[:-1])/6,2))+'$')
    except:
        print("Input Error!")

2.3 实例2的修改

#draw a multicolored python
from turtle import *
setup(500, 400, 200, 200)
pencolor('green')
penup()
fd(-250)
pendown()
pensize(20)
seth(-40)
r = 0.1
g = 0.2
b = 0.3
for i in range(4):
    pencolor((r+0.1*i, g+0.1*i, b+0.1*i))
    circle(40, 80)
    circle(-40, 80)
pencolor((r+0.1*4, g+0.1*4, b+0.1*4))
circle(40, 80/2)
fd(40)
pencolor((r+0.1*5, g+0.1*5, b+0.1*5))
circle(16, 180)
fd(40*2/3)
done()

2.4 等边三角形

# Equilateral Triangle
from turtle import *
setup(500, 400, 200, 200)
pencolor('green')
penup()
fd(-100)
seth(-90)
fd(50)
pendown()
pensize(5)
for theta in [0,120,-120]:
    seth(theta)
    fd(200)
done()

2.5 叠加等边三角形

#叠加等边三角形的绘制
len = 40
#ang = 60
from turtle import *
setup()
seth(0)
fd(len)
seth(120)
fd(len)
seth(240)
fd(2*len)
seth(0)
fd(2*len)
seth(120)
fd(len)
seth(240)
fd(len)
seth(120)
fd(len)
done()

2.6 无角正方形

# Square without corners
from turtle import *
setup(500, 400, 200, 200)
pencolor('green')
penup()
fd(-100)
seth(-90)
fd(60)
for i in [0,90,180,270]:
    fd(40)
    seth(i)
    fd(40)
    pendown()
    fd(120)
    penup()   
done()

2.7 六角形

#绘制六角形
from turtle import *
len = 180
for i in [0,1]:
    seth(30+60*i)
    fd(len)
    seth(270+60*i)
    fd(len)
    seth(150+60*i)
    fd(len)
    penup()
    seth(-30)
    fd(len/3)
    seth(-90)
    fd(len/3)
    pendown()
done()

2.8 正方形螺旋线

# 绘制正方形螺旋线
from turtle import *
len = 500
setup()
penup()
seth(180)
fd(250)
seth(270)
fd(250)
pendown()
speed(10)
for i in range(1,15):
    seth(90)
    fd(len)
    seth(0)
    len = len - 9
    fd(len)
    seth(-90)
    len = len - 9
    fd(len)
    seth(180)
    len = len - 9
    fd(len)
    len = len - 9
done()