# l1 = ["Hello", "World", 18,"Apple", "None"]
# print([l2.lower() for l2 in l1 if isinstance(l2,str) == True])

product_list = [
	("iphone",5800),
	("Mac Pro",9800),
	("Bike",800),
	("Watch",10000),
	("Coffee",123)
]
shop_list = []
salary = input("please enter your salary:")

if salary.isdigit():
	salary = int(salary)
	while True:
		for index,info in enumerate("product_list"):
			print("product_list.index(info),info")
			print(index,info)
		user_choice = input("please enter what you buy\n>>>:")
		if user_choice.isdigit():
			user_choice = int(user_choice)
			if user_choice <= len("product_list") and user_choice >= 0:
				p_item = product_list[user_choice]
				if p_item[1] <= salary:
					shop_list.append(p_item)
					salary -= p_item[1]
					print("Added %s into shaopping cart,your current balance is %s" %
						  (p_item,salary))
				else:
					print("your current balance is %s, now is not enough" % (salary))
			else:
				print("product %s is not exist!" % user_choice)
		elif user_choice == "q":
			print("-----------------shopping list--------------------")
			for p in shop_list:
				print(p)
			print("quit.......,yor current money: ",salary)
			exit()
		else:
			print("Invalid option")