本文实例讲述了Python实现的购物车功能。分享给大家供大家参考，具体如下：
这里尝试用python实现简单的购物车程序。。。
基本要求：
用户输入工资，然后打印购物菜单
用户可以不断的购买商品，直到余额不够为止
退出时打印用户已购买的商品和剩余金额。。。
代码：
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#!/usr/env python#coding:utf-8import re,mathdef get_customer_salary(): while True: salary=raw_input('Please input your monthly salary(a positive integer):') if __is_valid_num(salary): return int(salary) else: print '[warn] Please input a valid number!'def __is_valid_num(num): p=re.compile(r'^\d+$') m=p.match(num) if m: return True else: return Falsedef get_customer_selection(): while True: selection=raw_input('Please enter the goods number you want to buy:') if __is_valid_num(selection): if __is_a_valid_selection(int(selection)): return int(selection) else: print '[warn] Please enter a valid selection number' else: print '[warn] Please enter a valid number!\n'def __is_a_valid_selection(selection): if 1<=selection<=get_total_amount_of_products(): return True else: return Falsedef get_products_list(): return {'Flower':50,'Perfume':300,'Shoes':600,'Clothing':800,'Alcohol':300, 'Makeup':800,'Bike':1500,'Car':200000,'Apartment':5000000}def get_total_amount_of_products(): return len(get_products_list())def mapping_type_code_for_products(): return ['Flower','Perfume','Shoes','Clothing','Alcohol','Makeup','Bike','Car','Apartment']def get_product_price(type_code): return get_products_list()[get_product_name(type_code)]def get_product_name(type_code): return mapping_type_code_for_products()[type_code-1]def get_lowest_price_of_products(): price_list=[] for k,v in get_products_list().items(): price_list.append(v) return min(price_list)def get_highest_price_of_produces(): price_list=[] for k,v in get_products_list().items(): price_list.append(v) return max(price_list)def still_can_buy_something(left_money): if left_money<get_lowest_price_of_products(): return False else: return Truedef still_want_to_buy_something(): while True: answer=raw_input('Do you still want to buy something?(y/n):') result=is_a_valid_answer(answer) if result=='yes':return True if result=='no':return False print '[warn] Please enter [yes/no] or [y/n]!\n'def is_a_valid_answer(answer): yes_pattern=re.compile(r'^[Yy][Ee][Ss]$|^[Yy]$') no_pattern=re.compile(r'^[Nn][Oo]$|^[Nn]$') if yes_pattern.match(answer):return 'yes' if no_pattern.match(answer):return 'no' return Falsedef show_shopping_list(): counter=1 for i in mapping_type_code_for_products(): print '''''(%d) %s: %s RMB''' % (counter,i+' '*(10-len(i)),str(get_products_list()[i])) counter+=1def is_affordable(left_money,product_price): if left_money>=product_price: return True else: return Falsedef time_needed_to_work_for_buying_products(salary,price): result=float(price)/salary return get_formatting_time(int(math.ceil(result)))def get_formatting_time(months): if months<12:return ('%d months' % months) years=months/12 months=months%12 return ('%d years,%d months' % (years,months))#主程序从这里开始if __name__=='__main__': salary=get_customer_salary() #获取月工资 total_money=salary shopping_cart=[] #初始化购物车 while True: show_shopping_list() #打印购物列表 #判断剩余资金是否能够购买列表中的最低商品 if still_can_buy_something(total_money): selection=get_customer_selection() #获取用户需要购买的商品编号 product_price=get_product_price(selection)#获取商品的价格 product_name=get_product_name(selection)#获取商品的名称 if total_money>=product_price: total_money-=product_price #打印购买成功信息 print 'Congratulations!You bought a %s successfully!\n' % product_name shopping_cart.append(product_name)#将商品加入购物车 print 'You still have %d RMB left\n' % total_money #打印剩余资金 #判断是否还想购买其他商品 if not still_want_to_buy_something(): print 'Thank you for coming!' break else: #输出还需要工作多久才能购买 format_time=time_needed_to_work_for_buying_products(salary,product_price-total_money) print 'Sorry,you can not afford this product!\n' print "You have to work '%s' to get it!\n" % format_time #判断是否还想购买其他商品 if not still_want_to_buy_something():break else: print 'Your balance is not enough and can not continue to buy anything.' break #打印购物车列表 print 'Now,your balance is %d,and\nYou have buy %s' % (total_money,shopping_cart) |
运行效果：
希望本文所述对大家Python程序设计有所帮助。
原文链接：http://blog.csdn.net/sxingming/article/details/52334488
