如果python中的if语句不起作用，但是返回其他值

Question

我有问题。我不明白为什么代码没有执行。仅返回else值。请帮忙。巨大的绝望。预先谢谢！

def discounted_price(unit_price,quantity):
    if unit_price >= 200:
        discounted_price=(0.9*unit_price)*quantity
    elif quantity >= 20 and quantity%5==0: 
        discounted_price=unit_price*(quantity-(quantity/5))
    elif quantity >= 20:
        discounted_price=unit_price*(quantity-int(quantity/5))
    else:
        discounted_price=unit_price*quantity
        return discounted_price

Answer 1

在python中，缩进很重要，要从所有条件返回值，return语句必须在else范围之外，如下所示：

def discounted_price(unit_price,quantity):
    if unit_price >= 200:
        discounted_price=(0.9*unit_price)*quantity
    elif quantity >= 20 and quantity%5==0: 
        discounted_price=unit_price*(quantity-(quantity/5))
    elif quantity >= 20:
        discounted_price=unit_price*(quantity-int(quantity/5))
    else:
        discounted_price=unit_price*quantity
    return discounted_price  # <-- changed indentation