我的"if"声明中的"或"有什么问题？

Question

我试过谷歌,但我找不到这个简单问题的答案.我讨厌自己无法解决这个问题,但我们走了.

如何在其中编写if语句or？

例如:

if raw_input=="dog" or "cat" or "small bird":
    print "You can have this animal in your house"
else:
    print "I'm afraid you can't have this animal in your house."

Answer 1

您可以将允许的动物放入tuple然后使用in以搜索匹配

if raw_input() in ("dog", "cat", "small bird"):
    print "You can have this animal in your house"
else:
    print "I'm afraid you can't have this animal in your house."

你也可以在set这里使用,但我怀疑它会改善这么少的允许动物的表现

desired_animal = raw_input()
allowed_animals = set(("dog", "cat", "small bird"))
if desired_animal in allowed_animals:
    print "You can have this animal in your house"
else:
    print "I'm afraid you can't have this animal in your house."

Answer 2

如果你想使用or,你需要每次重复整个表达式:

if raw_input == "dog" or raw_input == "cat" or raw_input == "small bird":

但是,进行这种特殊比较的更好方法是in:

if raw_input in ("dog", "cat", "small bird"):