本文實例講述了Python實現購物車功能的方法。分享給大家供大家參考，具體如下：
1、程序的源代碼如下：
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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 = []#推出標志位exit_flag = 0while 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 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、程序運行結果
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input your salary:10000-----------welcome to our shoping mall------------------------------product list :------------------0 Iphone 58881 Mac Air 80002 XiaoMi 19.93 coffee 304 Tesla 8200005 Bike 7006 Cloth 200[q=quit,c=check] what do you want to buy?:0added [[('Iphone', 5888)]] into shop car ,yourcurrent balence is 4112------------------product list :------------------0 Iphone 58881 Mac Air 80002 XiaoMi 19.93 coffee 304 Tesla 8200005 Bike 7006 Cloth 200[q=quit,c=check] what do you want to buy?:1Your balance is [4112],cannot buy the product!------------------product list :------------------0 Iphone 58881 Mac Air 80002 XiaoMi 19.93 coffee 304 Tesla 8200005 Bike 7006 Cloth 200[q=quit,c=check] what do you want to buy?:cshop car list are [[('Iphone', 5888)]],your balance is 4112------------------product list :------------------0 Iphone 58881 Mac Air 80002 XiaoMi 19.93 coffee 304 Tesla 8200005 Bike 7006 Cloth 200[q=quit,c=check] what do you want to buy?:4Your balance is [4112],cannot buy the product!------------------product list :------------------0 Iphone 58881 Mac Air 80002 XiaoMi 19.93 coffee 304 Tesla 8200005 Bike 7006 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、學習到的知識點
（1）print('product list :'.center(50,'-'))
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>>> print('product list :'.center(50,'-'))------------------product list :------------------ |
（2）for item in enumerate(product_list):
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>>> 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行取值。
希望本文所述對大家Python程序設計有所幫助。
原文鏈接：http://blog.csdn.net/zora_lee/article/details/51635428
