语言基础模块-购物车作业
作业要求
购物车
1. 商品信息- 数量、单价、名称
2. 用户信息- 帐号、密码、余额
3. 用户可充值
4. 购物历史信息
5. 允许用户多次购买，每次可购买多件
6. 余额不足时进行提醒
7. 用户退出时 ，输出当次购物信息
8. 用户下次登陆时可查看购物历史
9. 商品列表分级显示
上述要求基本实现，但是还有些细节需要优化
流程图：
# -*- coding:utf-8 -*-
# Readme
# Author: Elijah
# Time: 2017-06-07
# Function:购物车
# 1. 商品信息- 数量、单价、名称
# 2. 用户信息- 帐号、密码、余额
# 3. 用户可充值
# 4. 购物历史信息
# 5. 允许用户多次购买，每次可购买多件
# 6. 余额不足时进行提醒
# 7. 用户退出时 ，输出当次购物信息
# 8. 用户下次登陆时可查看购物历史
# 9. 商品列表分级显示
#
# Need Environment：Python 3.5 、PyCharm
# Move：
# Feature：
# Important py file：getpass,time
# How To：Execute directly
# 个人发挥：
# 个人博客地址：http://blog.csdn.net/dragonyangang/article/details/72862830
import time, getpass
# 商品清单(字典)
product_list = {
'服装': {
'外套': {
'皮衣': {
'加绒皮衣': {'price': 2000, 'num': 0, 'sum': 10},
'机车皮衣': {'price': 1000, 'num': 0, 'sum': 10},
'牛皮皮衣': {'price': 1500, 'num': 0, 'sum': 10},
'羊皮皮衣': {'price': 1800, 'num': 0, 'sum': 10},
},
'风衣': {
'立领风衣': {'price': 500, 'num': 0, 'sum': 10},
'双层领风衣': {'price': 800, 'num': 0, 'sum': 10},
}
},
'西装': {
'休闲西装': {
'韩版休闲西装': {'price': 600, 'num': 0, 'sum': 10},
'欧美风休闲西装': {'price': 500, 'num': 0, 'sum': 10},
},
'宴会西装': {
'修身燕尾服': {'price': 1200, 'num': 0, 'sum': 10},
'宫廷装': {'price': 1000, 'num': 0, 'sum': 10},
},
},
'裤子': {
'休闲裤': {
'修身休闲裤': {'price': 300, 'num': 0, 'sum': 10},
'宽松休闲裤': {'price': 280, 'num': 0, 'sum': 10},
},
'牛仔裤': {
'紧身牛仔裤': {'price': 180, 'num': 0, 'sum': 10},
'镂空牛仔裤': {'price': 230, 'num': 0, 'sum': 10},
},
},
},
'家电': {
'电视': {
"液晶电视": {
'32寸液晶电视': {'price': 1400, 'num': 0, 'sum': 10},
'42寸液晶电视': {'price': 2200, 'num': 0, 'sum': 10},
'55寸液晶电视': {'price': 4500, 'num': 0, 'sum': 10},
},
"网络电视": {
'2K网络电视': {'price': 1500, 'num': 0, 'sum': 10},
'4K网络电视': {'price': 3200, 'num': 0, 'sum': 10},
'曲面网络电视': {'price': 4600, 'num': 0, 'sum': 10},
}
},
'空调': {
'挂壁式空调': {
'冷暖型挂壁式空调': {'price': 1600, 'num': 0, 'sum': 10},
'单冷型挂壁式空调': {'price': 1800, 'num': 0, 'sum': 10},
},
'柜式空调': {
'2匹柜式空调': {'price': 4000, 'num': 0, 'sum': 10},
'3匹柜式空调': {'price': 6000, 'num': 0, 'sum': 10},
},
},
},
}
# 用于分级显示
current_layer = product_list
last_layer = [product_list]
# 用户存储用户购物信息，用户购物结束输出
bill = []
# 标志位、计数器
r_flag = False
l_flag = False
op_flag = False
shop_flag = False
count = 0
count_layer = 0
total_cost = 0
#全局变量
gl_user_info = ''
gl_user_locked = ''
username = ''
password = ''
while not op_flag:
# 用户选择界面，可以进行注册、登陆和退出
choice = input("Input 'R(Register)' to Register \nInput 'L(login)' to Login \nInput 'Q(quit)' to Quit \n>>>")
# 用户登陆功能
if choice.lower() == "l":
while not l_flag:
username = input("Input your username (or 'Q' for exit):").strip()
if username.lower() == "q":
op_flag = True
print("end".center(40, "-"))
break
password = input("Input your password (or 'Q' for exit):").strip()
if password.lower() == "q":
op_flag = True
print("end".center(40, "-"))
break
# 判断用户是否在锁定名单中
with open("user_locked.txt", mode="r", encoding="utf-8") as f_locked:
gl_user_locked = f_locked.read()
f_locked.close()
if username in gl_user_locked:
print("This username has been locked , please contact Administrator !\n")
break
with open("user_info.txt", mode="r", encoding="utf-8") as f:
# 校验账户
gl_user_info = f.read()
f.close()
if (("username:%s\npassword:%s")%(username,password)) in gl_user_info:
#登陆成功，进入购物车功能
op_flag = True
break
# 判断如果输入错误次数大于3次，则将用户加入至锁定名单
elif count >= 3:
gl_user_locked = gl_user_locked + username + "\n"
with open("user_locked.txt", mode="a", encoding="utf-8") as f_locked:
f_locked.write(gl_user_locked)
print(
"Sorry, you've try more than 3 times ,this username will be added in locked_list , "
"please contact Administrator !\n")
exit()
else:
count += 1
print(" Incorrect username or password ! Please ensure you have Account ! "
"You can retry and input 'R' to register .\n")
break
# 用户注册功能
if choice.lower() == "r":
while True:
new_username = input("Input new username (or 'Q' for exit):").strip()
if new_username.lower() == "q":
exit()
new_password = input("Input new password (or 'Q' for exit):").strip()
if new_password.lower() == "q":
exit()
with open("user_info.txt", mode="a+", encoding="utf-8") as f:
f.seek(0)
for line in f:
# 判断用户名是否已经存在，存在则不能注册
if line.startswith("username:") and new_username in line:
print("Sorry ! This username is already exist , please change !")
r_flag = True
break
# 如果用户输入的用户名已经存在，则退出重新输入用户名
if r_flag:
r_flag = False
continue
# 用户注册成功，返回用户选择界面，用户可以选择登陆、继续注册或退出
f.write("username:" + new_username + "\n")
f.write("password:" + new_password + "\n")
f.write(new_username + "_cash:" + str(0) + "\n")
print("Congratulation ! " + new_username + " Register Successful !\n")
break
# 用户退出功能
if choice.lower() == "q":
exit()
else:
continue
#登陆购物车成功，输出历史购物信息
print("Welcome " + username + " ! " + " Login Successful !")
cash = int(
gl_user_info[gl_user_info.find(username+"_cash:"):gl_user_info.find("\n",gl_user_info.find(username+"_cash:"))].split(":")[1].strip())
Consup_hist = gl_user_info
Consup_hist = Consup_hist[Consup_hist.find('\n', Consup_hist.find(username + '_cash')):
Consup_hist.find('username', Consup_hist.find(username + '_cash'))]
print("\nConsumption history below：" + "\n" + Consup_hist)
Consup_hist = ''
print("\nYour Balance is :" + str(cash))
if cash == 0:
cash = int(input("Please input your available cash:").strip())
while not shop_flag:
# 商品字典有4级，用计数器控制进入字典的层级数
if count_layer <= 3:
print("\n目前是第" + str(count_layer + 1) + "层商品目录")
for key in current_layer:
print(key)
choice = input("Input the Product Name you want to buy or input 'B' to back or input 'Q' to quit\n>>>").strip()
if choice in current_layer:
last_layer.append(current_layer)
current_layer = current_layer[choice]
count_layer += 1
if choice.lower() == 'b':
if last_layer:
if count_layer > 0:
count_layer -= 1
current_layer = last_layer[len(last_layer) - 1]
last_layer.pop()
continue
# 用户选择退出
if choice.lower() == 'q':
shop_flag = True
break
# 进入最后一层商品目录，显示单价和数量，提问用户选择是否购买
else:
print('单价：' + str(current_layer['price'])+ "\n",
'已购数量：' + str(current_layer['num'])+ "\n",
'库存数量：' + str(current_layer['sum'])+ "\n",
)
is_buy = input("If you decided to buy ,please input 'Y' or input 'B'to back or 'Q' to quit\n>>>").strip()
# 用户确认购买
if is_buy.lower() == 'y':
buy_num = input("Please input the Number you want to buy :\n>>>").strip()
if buy_num.isdigit():
if cash >= current_layer['price'] * int(buy_num):
count_layer = 0
cash -= current_layer['price'] * int(buy_num)
if (current_layer['sum'] <= 0) or (int(buy_num) > current_layer['sum']):
count_layer = 0
current_layer = last_layer[0]
last_layer.clear()
print("对不起！库存不足，请重新选择\nSorry！ Insufficient stock ！")
continue
else:
current_layer['sum'] -= int(buy_num)
current_layer['num'] += int(buy_num)
print("Added " + str(buy_num) + " * " + choice +
" into shopping cart ! Now your current cash is " +
str(cash) + "\n")
bill.append([choice, int(buy_num)])
total_cost += current_layer['price'] * int(buy_num)
# 更新购物信息
gl_user_info = gl_user_info[0:gl_user_info.index('\n', gl_user_info.index(username + '_cash'))] + \
"\n" + time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(time.time())) + \
"---history : " + choice + "---" + buy_num + "---cost: " + \
str(current_layer['price'] * int(buy_num)) + "\n"+ \
gl_user_info[gl_user_info.index('\n', gl_user_info.index(username + '_cash')) + 1:]
current_layer = product_list
# 用户余额不足
else:
count_layer = 0
print("The product price is " + str(current_layer['price']) + "*" + buy_num +
"! Your still need " + str(current_layer['price'] * int(buy_num) - cash) + "\n")
recharge_choice = input( "You can input 'RE' to recharge or 'Q' to quit !\n>>>").strip()
# 用户选择充值
if recharge_choice.lower() == 're':
recharge_num = input("Please input the Number you want to recharge : \n>>>").strip()
if recharge_num.isdigit():
cash += int(recharge_num)
if not recharge_num.isdigit():
count_layer = 0
current_layer = last_layer[0]
last_layer.clear()
print("Please input digit ！")
continue
print( "Recharge Successful ! Now your cash is " + str(cash) + "\n")
current_layer = product_list
continue
# 用户选择退出
elif recharge_choice.lower() == 'q':
shop_flag = True
break
else:
count_layer = 0
current_layer = last_layer[0]
last_layer.clear()
print("Entered incorrectly ! Please Reselection !")
continue
if not buy_num.isdigit():
print("请输入数字！")
# 用户返回上一层商品字典
elif is_buy.lower() == 'b':
if last_layer:
if count_layer > 0:
count_layer -= 1
current_layer = last_layer[len(last_layer) - 1]
last_layer.pop()
continue
# 用户退出前显示当次购物信息
elif is_buy.lower() == 'q':
shop_flag = True
break
#用户退出，输入本次购物信息并保存
print("Your Bill :\n名称\t数量\n" + "----"*10)
for i in bill:
print(i)
print("Total Cost : " + str(total_cost))
print("Balance : " + str(cash) + "\n" + "----"*10)
print("Looking forward to your next visit !!!")
gl_user_info = gl_user_info.replace(
(gl_user_info[gl_user_info.index(username + '_cash', gl_user_info.index(username))
:gl_user_info.index('\n', gl_user_info.index(username + '_cash'))]),(username + '_cash:' + str(cash) + '\n'))
with open("user_info.txt", mode="w", encoding="utf-8") as f:
f.write(gl_user_info)
exit()