python实例_购物车

Posted 2020-09-27

一，作者介绍

吴海东：My Blog:http://www.cnblogs.com/whd-672701

二，程序说明

 

购物车程序：

1、启动程序后，输入用户名密码后，如果是第一次登录，让用户输入工资，然后打印商品列表

2、允许用户根据商品编号购买商品

3、用户选择商品后，检测余额是否够，够就直接扣款，不够就提醒

4、可随时退出，退出时，打印已购买商品和余额

5、在用户使用过程中， 关键输出，如余额，商品已加入购物车等消息，需高亮显示

6、用户下一次登录后，输入用户名密码，直接回到上次的状态，即上次消费的余额什么的还是那些，再次登录可继续购买

7、允许查询之前的消费记录

三，程序前准备

创建一个购物物品文件“shopping”，物品可自行定义。

创建一个存放已购买物品的文件“lock_file”，开始默认为空。

四，程序脚本

 

shangpin = open("shopping",‘r‘,encoding="utf-8")
shangpin = list(shangpin)
shopping_list = []

def test():
    for index, i in enumerate(shangpin):
        print(index, i)
    mai = input("Want to buy what?>>>:")
    return mai


def test_1():
        jin = input("Please enter the amount:")
        if jin.isdigit():
            jin = int(jin)
            loginSucces = False
            while True:
                mai = test()
                if mai.isdigit():
                    mai = int(mai)
                    if mai < len(shangpin) and mai >= 0:
                        kemai = shangpin[mai]
                        kemai = kemai.strip().split(‘,‘)
                        kemaii = int(kemai[1])
                        if kemaii <= jin:
                            shopping_list.append(kemai)
                            jin -= kemaii
                            print("\\033[32;1mBuy the goods:%s,The balance remaining:%s\\033[0m" % (kemai, jin))
                            loginSucces = False
                            while True:
                                jixu = input("继续购买按y，或是退出按q:")
                                if jixu.isalpha():
                                    jixu = str(jixu)
                                if jixu == ‘y‘:
                                    break
                                if loginSucces == True:continue
                                elif jixu == ‘q‘:
                                    print("\\033[31;1m-----You bought the following goods altogether----")
                                    for p in shopping_list:
                                        print(p)
                                    f = open("lock_file", ‘a+‘, encoding="utf-8")
                                    f.write("{\\"%s\\":{\\"name\\":\\"%s\\",\\"shopping\\":%s,\\"remaining\\":%s}}\\n" % (str(username), str(username), str(shopping_list),
                                    str(jin)))
                                    f.close()
                                    if loginSucces == True: break
                                    print("The balance remaining:%s\\033[0m" % jin)
                                    exit()
                                    if loginSucces == True: break
                            continue
                        else:
                            print("Insufficient balance to buy:%s" % jin)
                            loginSucces = False
                        while True:
                            jixu = input("继续购买按y，或是退出按qq:")
                            if jixu.isalpha():
                                jixu = str(jixu)
                            if jixu == ‘y‘:
                                break
                            elif jixu == ‘q‘:
                                print("\\033[31;1m-----You bought the following goods altogether----")
                                for p in shopping_list:
                                    print(p)
                                f = open("lock_file", ‘a+‘, encoding="utf-8")
                                f.write("{\\"%s\\":{\\"name\\":\\"%s\\",\\"shopping\\":%s,\\"remaining\\":%s}}\\n" % (
                                str(username), str(username), str(shopping_list),
                                str(jin)))
                                f.close()
                                print("The balance remaining:%s\\033[0m" % jin)
                                exit()
                                if loginSucces == True:break

def test_2():
    for date in dataa:
        if username in date:
            print(dataa[username])
        else:
            continue
        jin = dataa[username]["remaining"]
        jine = jin
        jin = str(jin)
        if jin.isdigit():
                jin = int(jin)
                loginSucces = False
                while True:
                    mai = test()
                    if mai.isdigit():
                        mai = int(mai)
                        if mai < len(shangpin) and mai >= 0:
                            kemai = shangpin[mai]
                            kemai = kemai.strip().split(‘,‘)
                            kemaii = int(kemai[1])
                            if kemaii <= jin:
                                aa = dataa[username]["shangpin"]
                                aaa = aa
                                aaa = str(aaa)
                                shopping_list = dataa[username]["shangpin"]
                                shopping_list.append(kemai)
                                print(shopping_list)
                                shopping_li = shopping_list
                                shopping_li = str(shopping_li)
                                jin -= kemaii
                                jin = str(jin)
                                jine = str(jine)
                                print("\\033[32;1mBuy the goods:%s,The balance remaining:%s\\033[0m" % (kemai, jin))
                                loginSucces = False
                                while True:
                                    jixu = input("继续购买按y，或是退出按q:")
                                    if jixu.isalpha():
                                        jixu = str(jixu)
                                    if jixu == ‘y‘:
                                        break
                                    if loginSucces == True:
                                        continue
                                    elif jixu == ‘q‘:
                                        print("\\033[31;1m-----You bought the following goods altogether----")
                                        for p in shopping_list:
                                            print(p)
                                        with open("lock_file","r",encoding="utf-8") as f:
                                            lines = f.readlines()
                                        with open("lock_file","w",encoding="utf-8") as f_w:
                                            for line in lines:
                                                if username in line:
                                                    line = line.replace(aaa,shopping_li)
                                                f_w.write(line)
                                            f_w.close()

                                            with open("lock_file", "r", encoding="utf-8") as f:
                                                lines = f.readlines()
                                            with open("lock_file", "w", encoding="utf-8") as f_q:
                                                for line in lines:
                                                    if username in line:
                                                        line = line.replace(jine,jin)
                                                    f_q.write(line)
                                                f_q.close()
                                                print("The balance remaining:%s\\033[0m" % jin)
                                                exit()
                                                if loginSucces == True: break



username = input(‘xinuser:‘).strip()
with open("lock_file",‘r‘,encoding="utf-8") as f:
        for data in f:
            if len(data) != 0:
                dataa = eval(data)
                for date in dataa:
                    daa = date
                    if username in daa:
                        break
                    elif username not in daa:
                        continue
                test_2()

        else:
             password = input(‘passwd:‘).strip()
             test_1()