代码如下：
price = input("请输入商品价格以空格分割：").strip()
price = list(map(int,price.split(' ')))
amount = len(price)
if amount >= 5:
print(f"购买了{amount}件商品，享受八折优惠。优惠后的价格为:{sum(price)*0.8}，优惠金额为：{sum(price)*0.2}")
else:
print(f"购买了{amount}件商品。总价为:{sum(price)}")
输出如下：
#首先设置未知数amount = 0
total_cost = 0
money_saved = 0
#设置输入
price = input (“输入价格”：）
while price >0:
total_cost = total_cost + price
amount +=1
if amount <4:
total_off = total_cost * (1- amount/10.00)
#如果有变量
else:
total_off = total * 0.6
money_saved = total_cost - total_off
#输出价格，节省的金额和，实际支付的价格
print "几件物品： ",amount
print "总支付(¥): ",total_off
print "节省金额¥" , money_saved
