Question

item = "burrito"
meat = "chicken"
queso = False
guacamole = False
double_meat = False
if item == "quesadilla":
    base_price = 4.0
elif item == "burrito":
    base_price = 5.0
else:
    base_price = 4.5


if meat == "steak" or "pork":
    if double_meat:  
        if guacamole and queso and not item == "nachos":
            base_price += 1.00 + 1.50 + 0.50 + 1.00
        elif guacamole:
            base_price += 0.50 + 1.50 + 1.00
        else:
            base_price += 0.50 + 1.50 
    else:
        if guacamole and queso and not item == "nachos":
            base_price += 1.00 + 0.50 + 1.00
        elif guacamole:
            base_price += 0.50 + 1.00
        else:
            base_price += 0.50  
else:
    if double_meat:  
        if guacamole and queso and not item == "nachos":
            base_price += 1.00 + 1.00 + 1.00
        elif guacamole:
            base_price += 1.00 + 1.00
        else:
            base_price += 1.00 
    else:
        if guacamole and queso and not item == "nachos":
            base_price += 1.00 + 1.00
        elif guacamole:
            base_price += 1.00
        else:
            base_price += 0.00
print(base_price)

代码应计算给定条件（第1至5行）下的餐食费用。这些条件可以改变。上面代码的输出应为5.0，但我得到的输出等于5.5。该方案是代码的最后else条语句，其中base_price应该是5+0.00 = 5.00，因为墨西哥卷饼的价格是5.0。那么，我如何获得5.5？

Answer 1

您应该替换

if meat == "steak" or "pork":

与

if meat == "steak" or meat == "pork":

说明：

meat == "steak" or "pork"将顺序执行（==的优先级高于or），因此meat=="steak"为False，表达式为False or "Pork"，即"pork"是对的。

>>> meat = 'chicken'
>>> meat == 'steak' or 'pork'
'pork'
>>> meat == 'steak' or meat == 'pork'
False

为什么我得到错误的输出？

1 个答案: