布尔变量和If语句对true语句失败 [英] Boolean Variables and If statement fails for true statements

问题描述

提示:

Clunker Motors Inc.正在召回其1999年– 2002年的 Extravagant 系列中的所有车辆.在给定变量 modelYear 和 modelName 的情况下，如果 modelYear 和 modelName 的值与召回详细信息匹配并分配否否则.

Clunker Motors Inc. is recalling all vehicles in its Extravagant line from model years 1999 – 2002. Given variables modelYear and modelName write a statement that assigns True to recalled if the values of modelYear and modelName match the recall details and assigns False otherwise.

我编写了这段代码，但是对于正确的语句却一直得到错误的答案.虚假陈述来得很好.

I wrote this code but kept getting wrong answers for the true statements. The false statements came through just fine.

modelYear >= 1999 and modelYear <= 2002
modelName == "Extravagant"
if modelYear == True and modelName == True:
    recalled = True
else:
    recalled = False

推荐答案

执行时-

modelYear >= 1999 and modelYear <= 2002
modelName == "Extravagant"

您只是舍弃了这些布尔表达式的结果，这并不能神奇地产生 modelYear 或 modelName 布尔值.

You are just throwing away the result of those boolean expressions, this does not magically make modelYear or modelName boolean values.

您可以简单地在 if 块本身中使用表达式，而不是尝试创建布尔值.示例-

Instead of trying to create boolean values, you can simply use the expression in the if block itself. Example -

if 1999 <= modelYear <= 2002 and modelName == "Extravagant":
    recalled = True
else:
    recalled = False

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如果在真实代码的 if 块中，您要做的就是分配布尔值，那么您可以--p

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And if inside the if block in your real code, all you do is assign the boolean value, then you can do -

recalled = 1999 <= modelYear <= 2002 and modelName == "Extravagant"

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