Python实现购物车功能的方法分析_Python

本文实例讲述了Python实现购物车功能的方法。分享给大家供大家参考，具体如下：

1、程序的源代码如下：

									salary = input('input your salary:')

									if salary.isdigit:

									  salary = int(salary)

									else:

									  exit('salary is not digit!!')

									welcome_msg = 'welcome to our shoping mall'

									print(welcome_msg.center(50,'-'))

									product_list = [

									  ('Iphone',5888),

									  ('Mac Air',8000),

									  ('XiaoMi',19.9),

									  ('coffee',30),

									  ('Tesla',820000),

									  ('Bike',700),

									  ('Cloth',200)

									]

									shop_car = []

									#推出标志位

									exit_flag = 0

									while exit_flag is not True:

									  print('product list :'.center(50,'-'))

									  for item in enumerate(product_list):

									    index = item[0]   #获得商品序号

									    p_name = item[1][0]  #获得商品名称

									    p_price= item[1][1]  #获得商品价格

									    print(index,p_name,p_price)

									  user_choice = input('[q=quit,c=check] what do you want to buy?:')

									  if user_choice.isdigit():

									    user_choice = int(user_choice)

									    if user_choice < len(product_list): #输入的商品序号要在范围之内

									      p_item = product_list[user_choice] #选择的商品

									      if p_item[1] <= salary: #买得起

									        shop_car.append(p_item) #放入购物车

									        salary -= p_item[1] #减钱

									        print('purchased products are:'.center(40, '-'))

									        for item in shop_car:

									          print(item)

									        print('Your balance is [%s]' % salary)

									      else:          #买不起

									        print('Your balance is [%s],cannot buy the product!'%salary)

									    else:

									      print('we do not have the product,please input again!')

									  elif user_choice == 'q' or user_choice == 'quit':

									    print('purchased products are:'.center(40,'-'))

									    for item in shop_car:

									      print(item)

									    print('END '.center(40,'-'))

									    print('Your balance is [%s]'%salary)

									    exit_flag =True

									  elif user_choice == 'c' or user_choice == 'check':

									    print('purchased products are:'.center(40, '-'))

									    for item in shop_car:

									      print(item)

									    print('Your balance is %d' % salary)

									    print('Check '.center(40, '-'))

									  else:

									    print('Incorrect input ,please input again!!')

2、程序运行结果

									input your salary:10000

									-----------welcome to our shoping mall------------

									------------------product list :------------------

									0 Iphone 5888

									1 Mac Air 8000

									2 XiaoMi 19.9

									3 coffee 30

									4 Tesla 820000

									5 Bike 700

									6 Cloth 200

									[q=quit,c=check] what do you want to buy?:0

									added [[('Iphone', 5888)]] into shop car ,yourcurrent balence is 4112

									------------------product list :------------------

									0 Iphone 5888

									1 Mac Air 8000

									2 XiaoMi 19.9

									3 coffee 30

									4 Tesla 820000

									5 Bike 700

									6 Cloth 200

									[q=quit,c=check] what do you want to buy?:1

									Your balance is [4112],cannot buy the product!

									------------------product list :------------------

									0 Iphone 5888

									1 Mac Air 8000

									2 XiaoMi 19.9

									3 coffee 30

									4 Tesla 820000

									5 Bike 700

									6 Cloth 200

									[q=quit,c=check] what do you want to buy?:c

									shop car list are [[('Iphone', 5888)]],your balance is 4112

									------------------product list :------------------

									0 Iphone 5888

									1 Mac Air 8000

									2 XiaoMi 19.9

									3 coffee 30

									4 Tesla 820000

									5 Bike 700

									6 Cloth 200

									[q=quit,c=check] what do you want to buy?:4

									Your balance is [4112],cannot buy the product!

									------------------product list :------------------

									0 Iphone 5888

									1 Mac Air 8000

									2 XiaoMi 19.9

									3 coffee 30

									4 Tesla 820000

									5 Bike 700

									6 Cloth 200

									[q=quit,c=check] what do you want to buy?:q

									--------purchased products are:---------

									('Iphone', 5888)

									------------------END ------------------

									Your balance is [4112]

									Process finished with exit code 0

3、学习到的知识点

（1）print('product list :'.center(50,'-'))

1 2	`>>>` `print('product list :'.center(50,'-'))` `------------------product` `list` `:------------------`

（2）for item in enumerate(product_list):

									>>> for item in enumerate(product_list):

									print(item)

									(0, ('Iphone', 5888))

									(1, ('Mac Air', 8000))

									(2, ('XiaoMi', 19.9))

									(3, ('coffee', 30))

									(4, ('Tesla', 820000))

									(5, ('Bike', 700))

									(6, ('Cloth', 200))