Compare to multiple values in an if statement.

im going to need multiple if statements comparing to the same couple elements, and was wondering if there was something along these lines i could do to make the code cleaner and easier.

Example would be that this function.

def test(num): 

    a = [1, 2, 3]

    if num == a : 
        return True

    else : 
        return False

would return

>>>test(1)
True
>>>test(2)
True
>>>test(5)
False

Instead of having to write the separate if statements for 1, 2, and 3.