Python 3：如何在一行代码中比较多个字符串？

Question

I'm trying to make a category select (by text interface) in Python 3, and I was wondering how I can compare if multiple strings are not true, and then print something along the lines of "that is not a valid choice"

    input("what is your category choice?")
    if categoryChoice != "category1", "category 2", "category 3":
    print("not a valid choice")

I don't understand the syntax for having it check if any of category1, category2, category3, etc is true/false

Answer 1

Use in for containment tests.

categoryChoice = input("what is your category choice?")
if categoryChoice not in ("category1", "category 2", "category 3"):
    print("not a valid choice")

http://ideone.com/e6n0Rr

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By the way, if you're using Python 2, you should really use raw_input instead of input .