python第四周练习题

def shoping():
    balance=10000
    while True:
        with open("E:/product_list.txt",'r+') as f:
            product_list=f.readlines()
            print(product_list)
            f.close()
            allproduct=[]
            allprice=[]
            for   i   in    range (0,len(product_list)):
                productprice=product_list[i].split()
                productproduct=productprice[0]
                productprice=productprice[1]
                allproduct.append(productproduct)
                allprice.append(productprice)

            buysomething=input('what do you want to buy? please input number:')
            #检测账户余额是否足够
            if buysomething.isdigit():
                buysomething=int(buysomething)
                print(allprice[buysomething])
                if int(allprice[buysomething])<balance:
                    balance-=int(allprice[buysomething])
                    with open("E:/shop_list.txt",'a') as f2:#放入购物车
                        f2.write(str(allproduct[buysomething] +'   '+ allprice[buysomething]+ '\n'))
                    print('your balance is %s'%balance)
                    with open("E:/shop_list.txt",'r+') as f3:#放入购物车
                            shopbuy=f3.readlines()
                            print(shopbuy)
                            f3.close()



def login():
        f=open("E:/2.txt",'r+') #读取user配置文件。
        cont=f.readlines() #readlines把读取的行当作元素返回一个列表
        f.close()
        allname=[]         #初始化一个用户列表
        allpasswd=[]
        for i in range(0,len(cont)-1):          #len获取cont列表的元素数量
                onecont=cont[i].split()         #循环取一行内容并分割成列表，split（）以空格为分隔符分割字符串并返回一个列表。
                onename=onecont[0]              #循环取一行中的帐号
                onepasswd=onecont[1]            #
                allname.append(onename)         #循环把每一行取到的帐号追加到用户列表中
                allpasswd.append(onepasswd)
        lf=open("E:/3.txt",'r')
        lcont=lf.readlines()
        lf.close()
       # print(lcont) #打印用户锁文件内容
       # print(allname)
       # print(allpasswd)

        cont=0
        while cont < 3:
                username=input("login user:").strip()
                passwd=input("password:")
                if username not in allname:
                        print("No this accont!")

                elif (username +"\n") in lcont:
                        print("your account has been locked!Please contact admin!")
                        break
                else:
                        rel_passwd_index=allname.index(username) #取该帐号在用户列表中的索引，此时用户列表的索引和密码列表的索引是对应的，因此我们同样>取到了该帐号的密码在密码列表的索引
                        rel_passwd=allpasswd[rel_passwd_index]     #取该帐号的真实密码
                        if passwd==rel_passwd:
                                print("Login success!")
                                break
                        else:
                                print("password is error!")
                                cont+=1
        if cont >= 3:
                print("Excessive password error,your account has been locked!Please contact admin!")
                nf=open("E:/3.txt",'w')
                nf.write(username+"\n")
                nf.close()

ATM作业的购物车和登陆功能两个函数功能实现。还有ATM，交易中心未实现