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Python實現(xiàn)購物車功能的方法分析

更新時間：2017年11月10日 14:11:00 作者：媛妹子

這篇文章主要介紹了Python實現(xiàn)購物車功能的方法,結(jié)合實例形式分析了Python實現(xiàn)購物車功能的具體步驟、相關(guān)操作技巧與注意事項,需要的朋友可以參考下

本文實例講述了Python實現(xiàn)購物車功能的方法。分享給大家供大家參考，具體如下：

1、程序的源代碼如下：

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 = []
#推出標(biāo)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]   #獲得商品序號
    p_name = item[1][0]  #獲得商品名稱
    p_price= item[1][1]  #獲得商品價格
    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): #輸入的商品序號要在范圍之內(nèi)
      p_item = product_list[user_choice] #選擇的商品
      if p_item[1] <= salary: #買得起
        shop_car.append(p_item) #放入購物車
        salary -= p_item[1] #減錢
        print('purchased products are:'.center(40, '-'))
        for item in shop_car:
          print(item)
        print('Your balance is [%s]' % salary)
      else:          #買不起
        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、程序運行結(jié)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、學(xué)習(xí)到的知識點

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

>>> 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))

enumerate函數(shù)返回一個生成器對象：（index,item）的元組。

（3）這里使用了列表+元組的形式存儲商品列表，而不是字典，因為字典是無序的，每次打印順序都不一樣，而且不能通過索引進(jìn)行取值。

更多關(guān)于Python相關(guān)內(nèi)容感興趣的讀者可查看本站專題：《Python數(shù)據(jù)結(jié)構(gòu)與算法教程》、《Python加密解密算法與技巧總結(jié)》、《Python編碼操作技巧總結(jié)》、《Python函數(shù)使用技巧總結(jié)》、《Python字符串操作技巧匯總》及《Python入門與進(jìn)階經(jīng)典教程》

希望本文所述對大家Python程序設(shè)計有所幫助。

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