table of Contents
File combat the shopping cart system
User names and passwords are stored in a file in the format: nick | nick123
After starting the program, first login, the login is successful then allow users to enter wages, and then print the list of goods, fails to log in again, more than three times to exit the program
Allow users to purchase by product number
After the user selects a product, testing the balance is enough, enough to direct debit, is not enough to remind
Can withdraw at any time, when you exit, print the purchase of goods and balances
import os
product_list = [
['Iphone7', 5800],
['Coffee', 30],
['疙瘩汤', 10],
['Python Book', 99],
['Bike', 199],
['ViVo X9', 2499],
]
shopping_cart = {}
current_userinfo = []
db_file = r'db.txt'
while True:
print('''
登陆
注册
购物
''')
choice = input('>>: ').strip()
if choice == '1':
#1、登陆
tag = True
count = 0
while tag:
if count == 3:
print('\033[45m尝试次数过多，退出。。。\033[0m')
break
uname = input('用户名：').strip()
pwd = input('密码：').strip()
with open(db_file, 'r', encoding='utf-8') as f:
for line in f:
line = line.strip('\n')
user_info = line.split(',')
uname_of_db = user_info[0]
pwd_of_db = user_info[1]
balance_of_db = int(user_info[2])
if uname == uname_of_db and pwd == pwd_of_db:
print('\033[48m登陆成功\033[0m')
# 登陆成功则将用户名和余额添加到列表
current_userinfo = [uname_of_db, balance_of_db]
print('用户信息为：', current_userinfo)
tag = False
break
else:
print('\033[47m用户名或密码错误\033[0m')
count += 1
elif choice == '2':
uname = input('请输入用户名：').strip()
while True:
pwd1 = input('请输入密码：').strip()
pwd2 = input('再次确认密码：').strip()
if pwd2 == pwd1:
break
else:
print('\033[39m两次输入密码不一致，请重新输入！！!\033[0m')
balance = input('请输入充值金额：').strip()
with open(db_file, 'a', encoding='utf-8') as f:
f.write('%s,%s,%s\n' % (uname, pwd1, balance))
elif choice == '3':
if len(current_userinfo) == 0:
print('\033[49m请先登陆...\033[0m')
else:
#登陆成功后，开始购物
uname_of_db = current_userinfo[0]
balance_of_db = current_userinfo[1]
print('尊敬的用户[%s] 您的余额为[%s],祝您购物愉快' % (uname_of_db, balance_of_db))
tag = True
while tag:
for index, product in enumerate(product_list):
print(index, product)
choice = input('输入商品编号购物，输入q退出>>: ').strip()
if choice.isdigit():
choice = int(choice)
if choice < 0 or choice >= len(product_list): continue
pname = product_list[choice][0]
pprice = product_list[choice][1]
if balance_of_db > pprice:
if pname in shopping_cart: # 原来已经购买过
shopping_cart[pname]['count'] += 1
else:
shopping_cart[pname] = {
'pprice': pprice,
'count': 1
}
balance_of_db -= pprice # 扣钱
current_userinfo[1] = balance_of_db # 更新用户余额
print(
"Added product " + pname +
" into shopping cart,\033[42;1myour current\033[0m balance "
+ str(balance_of_db))
else:
print("买不起，穷逼! 产品价格是{price},你还差{lack_price}".format(
price=pprice, lack_price=(pprice - balance_of_db)))
print(shopping_cart)
elif choice == 'q':
print("""
---------------------------------已购买商品列表---------------------------------
id 商品 数量 单价 总价
""")
total_cost = 0
for i, key in enumerate(shopping_cart):
print('%22s%18s%18s%18s%18s' %
(i, key, shopping_cart[key]['count'],
shopping_cart[key]['pprice'],
shopping_cart[key]['pprice'] *
shopping_cart[key]['count']))
total_cost += shopping_cart[key][
'pprice'] * shopping_cart[key]['count']
print("""
您的总花费为: %s
您的余额为: %s
---------------------------------end---------------------------------
""" % (total_cost, balance_of_db))
while tag:
inp = input('确认购买(yes/no?)>>: ').strip()
if inp not in ['Y', 'N', 'y', 'n', 'yes', 'no']:
continue
if inp in ['Y', 'y', 'yes']:
# 将余额写入文件
src_file = db_file
dst_file = r'%s.swap' % db_file
with open(src_file,'r',encoding='utf-8') as read_f,\
open(dst_file,'w',encoding='utf-8') as write_f:
for line in read_f:
if line.startswith(uname_of_db):
l = line.strip('\n').split(',')
l[-1] = str(balance_of_db)
line = ','.join(l) + '\n'
write_f.write(line)
os.remove(src_file)
os.rename(dst_file, src_file)
print('购买成功，请耐心等待发货')
shopping_cart = {}
current_userinfo = []
tag = False
else:
print('输入非法')
elif choice == 'q':
break
else:
print('\033[33m非法操作\033[0m')登陆
注册
购物
>>: 2
请输入用户名：nick
请输入密码：123
再次确认密码：123
请输入充值金额：100000
登陆
注册
购物
>>: 1
用户名：nick
密码：123
[48m登陆成功[0m
用户信息为： ['nick', 88370]
登陆
注册
购物
>>: 3
尊敬的用户[nick] 您的余额为[88370],祝您购物愉快
0 ['Iphone7', 5800]
1 ['Coffee', 30]
2 ['疙瘩汤', 10]
3 ['Python Book', 99]
4 ['Bike', 199]
5 ['ViVo X9', 2499]
输入商品编号购物，输入q退出>>: 0
Added product Iphone7 into shopping cart,[42;1myour current[0m balance 82570
{'Iphone7': {'pprice': 5800, 'count': 1}}
0 ['Iphone7', 5800]
1 ['Coffee', 30]
2 ['疙瘩汤', 10]
3 ['Python Book', 99]
4 ['Bike', 199]
5 ['ViVo X9', 2499]
输入商品编号购物，输入q退出>>: 1
Added product Coffee into shopping cart,[42;1myour current[0m balance 82540
{'Iphone7': {'pprice': 5800, 'count': 1}, 'Coffee': {'pprice': 30, 'count': 1}}
0 ['Iphone7', 5800]
1 ['Coffee', 30]
2 ['疙瘩汤', 10]
3 ['Python Book', 99]
4 ['Bike', 199]
5 ['ViVo X9', 2499]
输入商品编号购物，输入q退出>>: q
---------------------------------已购买商品列表---------------------------------
id 商品 数量 单价 总价
0 Iphone7 1 5800 5800
1 Coffee 1 30 30
您的总花费为: 5830
您的余额为: 82540
---------------------------------end---------------------------------
确认购买(yes/no?)>>: yes
购买成功，请耐心等待发货
登陆
注册
购物
>>: q