Python实现的购物车功能示例
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：
#!/usr/env python
#coding:utf-8
import re,math
def 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+$')
m=p.match(num)
if m:
return True
else:
return False
def get_customer_selection():
while True:
selection=raw_input('Please enter the goods number you want to buy:')
if __is_valid_num(selection):
if __is_a_valid_selection(int(selection)):
return int(selection)
else:
print '[warn] Please enter a valid selection number'
else:
print '[warn] Please enter a valid number!\n'
def __is_a_valid_selection(selection):
if 1<=selection<=get_total_amount_of_products():
return True
else:
return False
def get_products_list():
return {'Flower':50,'Perfume':300,'Shoes':600,'Clothing':800,'Alcohol':300,
'Makeup':800,'Bike':1500,'Car':200000,'Apartment':5000000}
def get_total_amount_of_products():
return len(get_products_list())
def mapping_type_code_for_products():
return ['Flower','Perfume','Shoes','Clothing','Alcohol','Makeup','Bike','Car','Apartment']
def get_product_price(type_code):
return get_products_list()[get_product_name(type_code)]
def get_product_name(type_code):
return mapping_type_code_for_products()[type_code-1]
def get_lowest_price_of_products():
price_list=[]
for k,v in get_products_list().items():
price_list.append(v)
return min(price_list)
def get_highest_price_of_produces():
price_list=[]
for k,v in get_products_list().items():
price_list.append(v)
return max(price_list)
def still_can_buy_something(left_money):
if left_money<get_lowest_price_of_products():
return False
else:
return True
def still_want_to_buy_something():
while True:
answer=raw_input('Do you still want to buy something?(y/n):')
result=is_a_valid_answer(answer)
if result=='yes':return True
if result=='no':return False
print '[warn] Please enter [yes/no] or [y/n]!\n'
def is_a_valid_answer(answer):
yes_pattern=re.compile(r'^[Yy][Ee][Ss]$|^[Yy]$')
no_pattern=re.compile(r'^[Nn][Oo]$|^[Nn]$')
if yes_pattern.match(answer):return 'yes'
if no_pattern.match(answer):return 'no'
return False
def 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+=1
def is_affordable(left_money,product_price):
if left_money>=product_price:
return True
else:
return False
def 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：
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希望本文所述对大家Python程序设计有所帮助。
