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Why does "a == x or y or z" always evaluate to True? How can I compare "a" to all of those?（8个答案）
十小时前关门了。
我是Neewbie，我正在做CS50p，发现自己对第一个习题集感到困惑。
在www.example.com中，实现一个程序，提示用户回答生命、宇宙和万物的大问题，如果用户输入42或（不区分大小写）42或42，则输出"是"，否则输出"否"。deep.py, implement a program that prompts the user for the answer to the Great Question of Life, the Universe and Everything, outputting Yes if the user inputs 42 or (case-insensitively) forty-two or forty two. Otherwise output No.
所以我做了这个：

answ = input("What is Answer to the Great Question of Life, the Universe and Everything? ")

if answ == "42" or "forty two" or "forty-two":
    print("Yes")
else:
    print("No")

但输出总是"是"。
但是如果我这样切：

answ = input("What is Answer to the Great Question of Life, the Universe and Everything? ")

if answ == "42":
    print("Yes")
elif answ == "forty-two":
    print("Yes")
elif answ == "forty two":
    print("Yes")
else:
    print("No")

它起作用了。
非常感谢你简单的回答。