Python Practice--Shopping Cart Program

Ideas:

1. First generate a user dictionary file, the element contains the user name, password, balance, shopping cart list, quantity

2. Import dictionary content to verify login and record user information

3. Homepage can choose to login, register and browse the product list

4. Register the module, according to the dictionary key value to determine whether the user exists, there is return, there is no creation, password word limit did not do, Getpass module in the window platform error, no write

5. Login module, verify the successful login according to the dictionary content, do not successfully ask whether to register, three times verification failed to quit the program

6. After successful login, determine whether there is a balance in the user dictionary, do not exist, ask the user to enter the amount, and save in the dictionary

7. Print the product list, according to the user's choice: quit the program, log off the user, check the shopping cart, recharge, purchase function

8. Some features of shopping are not in-depth, for example, after adding to the shopping cart to cancel the purchase, the number of shopping options, etc., to be optimized

9. When exiting the program, save the newly generated user information to the user dictionary file.

The first time you need to write the dictionary content to a file:

# -*- coding: utf-8 -*-import pickleuser_list = {     ' Test1 ':{         ' username ': ' test1 ',          ' userpasswd ': ' 123456 ',         ' salary ': ',          ' Shop_car ': ',         ' shop_ Car_list ': '         },     ' Test ':{          ' username ': ' Test ',         ' USERPASSWD ': ' ABCD ',         ' salary ': ',          ' Shop_car ': ',         ' shop_car_list ': '          }    }f = open (' e:/linux  Study/python study/ Day2/user_list.txt ', ' WB ') Pickle.duMP (USER_LIST,F) F.close () 

# -*- coding: utf-8 -*-import picklef = open (' e:/linux  Study/python study/ Day2/user_list.txt ', ' RB ') User_list = pickle.load (f) f.close () def wirte_logout ():     f = open (' e:/linux  Learning/python Learning/day2/user_list.txt ', ' WB ')      Pickle.dump (user_list,f)     f.close ()     returnproduct_list =  [     (' iphone 6s ', 5299),     (' Iphone 6s plus ', 5999),     (' Sumsung s7 ', 3888),     (' Sumsung s7 edge ', 5688),     (' 360 f4  ', 799),     (' Red rice note3  ', 899),      (' Meizu  mx6 ', 1999),     (' Huawei  mate ', 2799),     ] Def index_page ():    page =  "[0] Login [1] registration [2] browse '      Print (' \ n ', ' test page '. Center (60, '-'),Page)     returndef login ():     print (' \ n ')      global user    count = 1    for i in  range (5):        if count <= 3:             user = input (' User login:  ')              password = input (' secret   Code:  ')             if user in user_ List.keys ():                 if  user == user_list[user][' username '] and password == user_list[user][' USERPASSWD ']:                     msg = "Welcome to login!" "                     print (msg)                      break                 else:                     print (' username or password is incorrect, please login again! ')             else:                 user_choice = input (' user does not exist, need to register ( y/n) ')                 if  user_choice ==  ' y ':                     add_user () &Nbsp;                    break                 elif user_choice ==  ' n ':                     pass             count += 1        elif  Count > 3:            exit (' Exceeded login count! Login failed ')             returndef add_user ():     global user    exit_flag = False     Print (' \ n ')     while not exit_flag:         username = input ('Please enter your user name: ')         if username in user_list.keys ():             print (' \ n username already exists, please enter another name \ n ')          else:             exit_flag = true    userpasswd = input (' Please enter your password ')      user_list[username] = {}    user_list[username][' username ']  = username    user_list[username][' userpasswd '] = userpasswd     user_list[username][' salary '] =  '     user_list[username][' Shop_car '] =  '     user_list[username][' shop_car_list '] =  '      print (' \ n registered successfully, your username is:%s '  % username, ' \ n ')     user =  user_list[username][' username '] &Nbsp;  returndef print_product_list ():     print (' \ n Product list: \ n ')      for item in enumerate (product_list):        &NBSP;INDEX&NBSP;=&NBSP;ITEM[0]&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;P_NAME&NBSP;=&NBSP;ITEM[1][0]         p_price = item[1][1]         print (Index, ': ', P_name,p_price)     returndef printending ():     print (' The product you have previously purchased '. Center (+, '-') ')     for item in user_list [User] [' Shop_car ']:                         a = user_list[user][' Shop_car '].index (item)          print (' Commodity:%s   price:%s   quantity:%s '  %  (user_ list[user][' Shop_car '][a][0],user_list[user][' Shop_car '][a][1],user_list[user][' shop_car_list '][a])                  print (' End '. Center (+, '-'))      print (' Your balance is:%s '  % user_list[user][' salary '], ' \ n ')     returnexit_ Flag = falsewhile not exit_flag:    index_page ()      index_user_choice = input (' Please enter the action you want to take: ')     if index_user_choice  ==  ' 0 ':         login ()          exit_flag = True    elif index_user_choice ==  ' 1 ':         add_user ()         exit _flag = true    elif index_user_choice ==  ' 2 ':         print_Product_list ()     else:        print (' input operation is invalid! ') print (' begin the shopping '. Center (+, '-'), ' \ n ') exit_flag2 = falsewhile not  exit_flag2:    if not user_list[user][' Salary ']:         salary = input (' Your balance is 0, please recharge the amount:  ')          if salary.isdigit ():             salary  = int (Salary)             user_list[user [' Salary '] = salary        else:             print (' The data type is incorrect, please enter a correct number! ')             continue    else :         salary = user_list[user][' salary ']    if not user_list[user][' Shop_car ']:         shop_car = []         shop_car_list = []    else:         shop_car = user_list[user][' Shop_car ']        shop_car _list = user_list[user][' Shop_car_list ']    print_product_list ()      print ("[Q=quit,c=check,l=logout,r=rechage]")     user_choice =  Input (' What do you want to buy? ')     if user_choice.isdigit ():         user_ Choice = int (User_choice)         if user_choice  < len (product_list):             p_item  = product_LIST[USER_CHOICE]&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;IF&NBSP;P_ITEM[1]  <= salary:                 if p_item not in shop_car:                     shop_car.append (P_item)                       Shop_car_list.append (1)                      user_list[user][' Shop_car '] = shop_car                     user_list[user [' Shop_car_list '] = shop_car_list                     salary -= p_item[1]                     user_list[user][' Salary '] = salary                      print (' Added on the cart:%s, the price is:%s, your balance is:%s '  %  (p_item[0],p_item[1],user_list[user][' salary '), ' \ n ')                 else:                      item_num = shop_car_list[shop_car.index (P_item)]+1                     shop_car_list[shop_car.index (p_ Item)] = item_num                     user_list[user][' Shop_car_list '] = shop_car_list                     salary -=  p_item[1]                     user_list[user][' Salary '] = salary                     print (' Added on the cart:%s, the price is:%s, your balance is: %s '  %  (p_item[0],p_item[1],user_list[user][' salary '), ' \ n ')              else:                 print (' Your balance is:%s, the balance is not enough to buy! '  % user_list[user][' salary ', ' \ n ')         else:             print (' The product you have chosen does not exist! ', ' \ n ')    else:        if user_choice ==  ' Q '  or user_choice ==  ' quit ':                      printending ()              print (' bye %s '  % user)              wirte_logout ()              exit_flag2 = true        elif user_ choice ==  ' C '  or user_choice ==  ' check ':             printending ()         elif  user_choice ==  ' l '  or user_choice ==  ' logout ':          &nBsp;  printending ()             login ()         elif user_choice ==  ' R '  or user_ choice ==  ' rechage ':             salary_ Change = input (' Please enter recharge amount: ')             if  salary_change.isdigit ():                 salary_change = int (Salary_change)                  salary += salary_change                 user_list[user][' Salary '] =  salary            else:         &nbsP;       print (' The data type is incorrect, please enter a correct number! ')                 continue         else:             print (' Please enter legal characters! ', ' \ n ')

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Python Practice--Shopping Cart Program