If-Elif-Else Python（打折场景）

Question

我正在开发这个计划，该计划根据客户的购买量提供折扣。

方向如下： 某些在线商店根据购买的总金额提供折扣：

        If the purchase total is over $50, a 5% discount is applied

        If the purchase total is over $100, a 10% discount is applied

        If the purchase total is over $500,  a 15% discount is applied

在应用任何折扣后，使用 if-elif-else 链计算购买金额。对于您的演示，请使用 499.99 美元的购买价格。

这是我迄今为止创建的，但它似乎无法正常运行，我想知道我可以做些什么来使我的代码更好，也许我是否正确使用了 if-elif-else 代码。提前谢谢大家。

if total_cost>=10:    
   if give_shopper_5percent_discount():
     print"You have won a discount"
     total_cost -= discount
   candidate_prime =True

elif total_cost>100:
   if give_shopper_10percent_discount():
     print"You have won a discount"
     total_cost -= discount
   candidate_prime =True


else total_cost>=500:
   if give_shopper_15percent_discount():
     print"You have won a discount"
     total_cost -= discount
   candidate_prime =True

Answer 1

根据您的描述，第一个total_cost 限制是错误的。并且你不应该在total_cost >= 500之前使用else

试试这个：

total_cost = int(input('Please enter a total_cost:'))
if total_cost>=500:    

   print"You have won a discount by 15 percent"
   total_cost *= 0.85



elif total_cost>100:

   print"You have won a discount by 10 percent"
   total_cost *= 0.9



elif total_cost>=50:

   print"You have won a discount by 5 percent"
   total_cost *= 0.95

else:
   print 'you total cost is not in the range of discount!'
print 'Now the total cost is ', total_cost

Answer 2

你必须先检查最大的折扣，否则你会按预期给予更多的折扣;-)

if total_cost>=500:
  ...
elif total_cost>=100:
  ...
elif total_cost>=10:
  ...
else: 
  pass

Answer 3

你的缩进不正常。这在 python 中很重要。 （试试这个？）

if give_shopper_5percent_discount():
    print"You have won a discount"
    total_cost -= discount
    candidate_prime =True

elif total_cost>100:
     if give_shopper_10percent_discount():
     print"You have won a discount"
     total_cost -= discount
      candidate_prime =True

else total_cost>=500:
      if give_shopper_15percent_discount():
      print"You have won a discount"
      total_cost -= discount
      candidate_prime =True

对于折扣也可以尝试乘法而不是减法。