[Python知识库]Python课后习题七和习题八

Python习题七
1.代码：

f = open('exercise7_1.txt','w')
for i in range(1,10):
    for j in range(1,i+1):
        f.write(str(j)+'x'+str(i)+'='+str(j*i)+' ')
    f.write("\n")
f.close()

运行结果：

2.代码：

str1 = input("请输入字符串：")
f = open('exercise7_2.txt','w',encoding='utf-8')
length= len(str1)
f.write("您输入的字符串的为:"+str1+'\n')
f.write("长度为:"+str(length))
f.close()

运行结果为：

3.代码：

from openpyxl import Workbook
workbook = Workbook()
worksheet = workbook.active
worksheet['C5'] = "我喜欢编程"
workbook.save("exercise7_3.xlsx")

运行结果：

Python习题八：
1.代码：

class Circle:
    def __init__(self,radius):
        self.radius=radius
    def getArea(self):
        return 3.1415*self.radius**2
    def getLen(self):
        return 3.1415*2*self.radius

for i in range(1,11):
    t=Circle(i)
    print("半径为%d的圆，面积:%.2f 周长：%.2f"%(t.radius,t.getArea(),t.getLen()))

运行结果：

2.运行结果应该为
inside fun,x,L 3 [9, 8]
x,L: 5 [4, 1]
inside fun,x,L 3 [4, 1, 8]
x,L: 5 [4, 1, 8]

代码：

def fun(x,L=[9]):
    x=3
    L.append(8)
    print("inside fun,x,L",x,L)

x=5
L=[4,1]
fun(x)
print("x,L:",x,L)
fun(x,L)
print("x,L:",x,L)

运行结果：

3.代码：

class Account:
    def __init__(self,usernumber,money,rate):
        self.__usernumber=usernumber
        self.__money=money
        self.__year_Rate=rate
    def month_Rate(self):
        return self.getyear_Rate() / 1200.0
    def month_Interest(self):
        return self.getmoney() * self.month_Rate()
    def getMoney(self, x):
        self.__money = self.getmoney() - x
    def deposit(self, x):
        self.__money = self.getmoney() + x
    def getUsernumber(self):
        return self.__usernumber
    def getmoney(self):
        return self.__money
    def getyear_Rate(self):
        return self.__year_Rate
    def setyear_Rate(self, year_Rate):
        self.__year_Rate = year_Rate
year_Rate = 4.5
usernumber = "998866"
money = 2000
count1 = Account(usernumber, money, year_Rate)
count1.deposit(150)
count1.getMoney(1500)
print("账号：", count1.getUsernumber())
print("余额：", count1.getmoney())
print("年利率：", str(count1.getyear_Rate()) + "%")
print("月利率：", str(count1.month_Rate() * 100) + "%")
print("月息：", count1.month_Interest())

运行结果：

4.代码：

class Timer:
    # def __init__(self,hour,min,sec):
    #     self.hour=hour
    #     self.min=min
    #     self.sec=sec
    def __init__(self):
        pass
    def getHour(self,hour):
        return self.hour
    def getMin(self,min):
        return self.min
    def getSec(self,sec):
        return self.sec
    def setHour(self,hour):
        self.hour=hour
    def setMin(self,min):
        self.min=min
    def setSec(self,sec):
        self.sec=sec
    def showTime(self):
        print("当前时间为:"+str(self.hour)+":"+str(self.min)+":"+str(self.sec))
#t1 = Timer(10,20,30)
t2 = Timer()
t2.setHour(10)
t2.setMin(20)
t2.setSec(20)
#t1.showTime()
t2.showTime()

运行结果：