python购物车程序详解用字典_使用python操作文件实现购物车程序

使用python操作文件实现购物车程序

题目要求如下：

实现思路

始终维护一张字典，该字典里保存有用户账号密码，购物车记录等信息。在程序开始的时候读进来，程序结束的时候写回文件里去。在登录注册的部分，我添加3次登录失败锁定的小功能，以前不会这样实现，现在一并做进去了。

在程序运行的过程中，随时键入q程序就退出，如果是进入到购买阶段，则会打印相应信息。

测试生成器代码

import json

data = {

'zsheng': {

'pwd': 'z123',

'lock': 0,

'balance': 0,

'login_times': 0,

'goods': []

},

'xsheng': {

'pwd': 'x123',

'lock': 0,

'balance': 0,

'login_times': 0,

'goods': []

},

'csheng': {

'pwd': 'c123',

'lock': 0,

'balance': 0,

'login_times': 0,

'goods': []

},

'vsheng': {

'pwd': 'v123',

'lock': 0,

'balance': 0,

'login_times': 0,

'goods': []

}

}

f = open('data.json', mode='w', encoding='utf-8')

data2 = json.dumps(data)

f.write(data2)

f.close

完整实现代码

import json

f = open('data.json', mode='r+', encoding='utf-8')

my_data = json.loads(f.read())

# 登录验证模块 登录失败程序结束，登录成功则返回用户名

def login():

while 1:

username = input('Please input your username: ')

if username == 'q':

exit()

if username not in my_data:

print('Wrong username!')

continue

if username in my_data:

if my_data[username]['lock'] == 1:

print('Your account is locked! Refuse to login!')

exit()

count = 0

while 1:

count += 1

if count > 3:

my_data[username]['lock'] = 1

f.seek(0)

f.write(json.dumps(my_data))

print('Your account is locked!')

exit()

print('This is your %d time try!' % count)

password = input('Please input your password: ')

if my_data[username]['pwd'] == password:

print('Welcome to login %s' % username)

return username

elif password == 'q':

exit()

else:

print('Wrong password, retry!')

continue

# 查询记录模块，可打印已购商品和余额信息

def print_cart(username):

if my_data[username]['goods']:

print('你的购物车物品如下：')

for i in range(len(my_data[username]['goods'])):

print(i, my_data[username]['goods'][i]['name'], my_data[username]['goods'][i]['price'])

else:

print('你的购物车里没有商品。')

print('您还剩余\033[1;31;40m%s\033[0m元!' % my_data[username]['balance'])

# 购买商品模块

def shopping(username):

while 1:

print('本店在售的商品如下：')

for i in range(len(goods)):

print(i, goods[i]['name'], goods[i]['price'])

no = input('please input goods number that you want to buy:')

if no == 'q':

print_cart(username)

# 程序退出时把数据写入文件中

f.seek(0)

f.write(json.dumps(my_data))

f.close()

print('欢迎下次光临！')

exit()

elif no.isdigit():

no = int(no)

if not 0 <= no < len(goods):

print('programme wrong!')

exit()

if my_data[username]['balance'] - goods[no]['price'] > 0:

my_data[username]['balance'] -= goods[no]['price']

my_data[username]['goods'].append(goods[no])

print('物品\033[1;31;40m%s\033[0m已经添加到购物车！' % (goods[no]['name']))

print('您还剩余\033[1;31;40m%s\033[0m元!' % my_data[username]['balance'])

else:

print('钱不够啦！')

print('您还剩余\033[1;31;40m%s\033[0m元!' % my_data[username]['balance'])

print('您要买的物品价值\033[1;31;40m%s\033[0m元!' % (goods[no]['price']))

print('如需结束购买，请按q')

else:

print('programme wrong!')

exit()

goods = [

{"name": "电脑", "price": 1999},

{"name": "鼠标", "price": 10},

{"name": "油条", "price": 20},

{"name": "女票", "price": 998},

{"name": "机械键盘", "price": 388},

{"name": "降噪耳机", "price": 1234},

{"name": "地狱火X6", "price": 7999},

{"name": "Luffycity_python_course", "price": 99}

]

username = login()

my_data[username]['login_times'] += 1

print('这是你第 %d 次登录' % my_data[username]['login_times'])

if my_data[username]['login_times'] > 1:

print('你上一次的消费记录如下：')

print_cart(username)

shopping(username)

else:

budget = input("please input your salary: ")

if budget.isdigit():

budget = int(budget)

else:

print('sorry you have no money!')

exit()

my_data[username]['balance'] = budget

print('start shopping, enter q to quit')

shopping(username)

f.close()

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