python练习_购物车(简版)

时间:2023-01-27 11:58:26

 python练习_购物车(简版)

需求:

  1. 写一个python购物车可以输入用户初始化金额
  2. 可以打印商品,且用户输入编号,即可购买商品
  3. 购物时计算用户余额,是否可以购买物品
  4. 退出结算时打印购物小票

以下代码实现的功能与思路:

功能: 

  (1)预算金额控制,只能输入大于0的数字
  (2)商品格式化打印
  (3)选择完成要买的商品后,提示用户再次确认,确认后开始计算用户余额是否大于等于商品价格,价格正确后则加入购物车
  (4)输入q则进行结算,结算时将重复的商品进行合并,显示个数,并计算消费总额和余额

思路:

  (1)商品打印通过嵌套列表实现

  (2)购买商品是只需要比较用户余额和商品价格即可,如果比商品金额打就把这个商品加入到一个列表中

  (3)结算时计算用户购物车列表即可

流程图:

python练习_购物车(简版)

使用方法:

  执行环境:Python3.5

  执行方法,执行执行即可

代码:

 #!/usr/bin/env python
# -*- coding: utf-8 -*- import time List_items = [ ["iPhone4",100],["iPhone5",200],["iPhone6",300],["iPhone7",4000],["Python",10000],]
User_shopping_cart = [] def in_money():
'''
判断用户输入金额的函数
'''
global user_in_money
while True:
user_in_money = input("Please enter initial funds:").strip()
if user_in_money.isdigit():
if int(user_in_money) > 0:
while True:
print_lists()
else:
print("\033[31mInput Error!\033[0m")
else:
print("\033[31mInput Error!\033[0m") def print_lists():
'''
获取用户输入的编号,调用结算模块
:return:
'''
print("Product List".center(40,"-"))
Spaces = " "*2
for Product_info in List_items:
Underlined = 20-len(Product_info[0])
print(Spaces,List_items.index(Product_info)+1,Spaces,Product_info[0],"."*Underlined,Product_info[1])
print("-"*40) in_Numbering = input("Please enter the product number,[q]exit billing:").strip()
if in_Numbering.isdigit():
if int(in_Numbering) > 0 and int(in_Numbering)<= len(List_items):
Transaction_Calculations(in_Numbering)
else:
print("\033[31mThe item number does not exist!\033[0m")
else:
if in_Numbering == "q":
settlement()
else:
print("\033[31mInput Error!\033[0m") def Transaction_Calculations(Numbering):
'''
加入购物车模块,判断用户余额是否足够购买商品
'''
global user_in_money
user_in_money = int(user_in_money)
Numbering = int(Numbering)
Pu_confirmation = input("Product \033[32m%s\033[0m Whether to add to cart(y/n):"%List_items[Numbering-1][0]).strip()
if Pu_confirmation == "y":
if user_in_money >= List_items[Numbering-1][1]:
User_shopping_cart.append(List_items[Numbering-1])
user_in_money = user_in_money - List_items[Numbering-1][1]
print("Product %s Added Cart, Current Balance %s¥"%( List_items[Numbering-1][0],user_in_money))
else:
print("The balance is insufficient, the commodity price \033[31m%s\033[0m¥,lacks \033[31m%s\033[0m¥"%(List_items[Numbering-1][1],List_items[Numbering-1][1]-user_in_money))
else:
print("\033[31mNot added to cart\033[0m") def settlement():
'''
结算模块
'''
if len(User_shopping_cart) == 0:
print("Shopping Cart There are no products, thank you patronage goodbye")
exit()
else:
print("Shopping list".center(50,"-"))
consumption = 0
new_user = []
[new_user.append(i) for i in User_shopping_cart if not i in new_user]
for user_cart in new_user:
number = User_shopping_cart.count(user_cart)
settlement_un = 15-len(user_cart[0])
to_settlement_un = 25 - settlement_un - len(str(user_cart[1])) - len(user_cart[0])
consumption += user_cart[1]*number
print(" "*5,user_cart[0],"."*settlement_un,user_cart[1],"¥","."*to_settlement_un,"%s个"%(number))
times = time.strftime("%Y-%m-%d %H:%M:%S",time.localtime(time.time()))
print(times.center(50,"-"))
print("Shopping cost \033[32m%s\033[0m¥, Current balance \033[32m%s\033[0m¥,Thank you to patronize!".center(50,"-")%(consumption,user_in_money))
exit() if __name__ == "__main__":
in_money()

购物车