[ Python -1 ] 简易购物车程序
练习:
1. 要求用户输入总资产,例如:2000
2. 显示商品列表,让用户根据序号选择商品,加入购物车
3. 购买,如果商品总额大于总资产,提示账户余额不足,否则,购买成功。
goods = [{'name':'电脑', 'price':1999},{'name':'鼠标', 'price':10},{'name':'游艇', 'price':20},{'name':'玩具', 'price':998},]
p1 = int(input('enter your money:'))
while True:
if not isinstance(p1, int):
raise TypeError('bad type.')
for i in goods:
print(goods.index(i), i)
p2 = int(input('enter your price:'))
if p2 == 0:
p1 = p1 - int(goods[p2]['price'])
if p1 < 0:
print('余额不足。')
break
else:
print('***********************')
print('当前余额:', p1)
print('***********************')
elif p2 == 1:
p1 = p1 - int(goods[p2]['price'])
# print(p3)
if p1 < 0:
print('余额不足。')
break
else:
print('***********************')
print('当前余额:', p1)
print('***********************')
elif p2 == 2:
p1 = p1 - int(goods[p2]['price'])
# print(p3)
if p1 < 0:
print('余额不足。')
break
else:
print('***********************')
print('当前余额:', p1)
print('***********************')
elif p2 == 3:
p1= p1 - int(goods[p2]['price'])
# print(p3)
if p1 < 0:
print('余额不足。')
break
else:
print('***********************')
print('当前余额:', p1)
print('***********************')
else:
print('***********************')
print('商品序号错误,请重新输入。')
print('***********************')
主要练习点:
1. 列表(list)、字典(dist) 类型灵活运用。
2. 条件判断while 、 if ... break
修改一版:
# -*- coding: utf-8 -*- goods_list = [ ['computer', 5000], ['apple', 500], ['pen', 50], ] salary = float(input('enter your salary:')) while True: for index, item in enumerate(goods_list, 1): print(index, item) choice = input('enter your choice:') if choice == 'q': break if choice.isdigit() == False: print('\033[31;1m输入编号错误,请重新输入\033[1m') elif int(choice) > len(goods_list) or int(choice) < 1: print('\033[31;1m编号不在商品列表中\033[1m') else: choice_buy = int(choice) -1 if salary >= goods_list[choice_buy][1]: print('\033[32;1m购买成功.\033[1m') salary = salary - goods_list[choice_buy][1] else: print('\033[31;1m购买失败\033[1m') break

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