FAQ: Learn Python - Practice Makes Perfect - is_even

This community-built FAQ covers the “is_even” exercise in Codecademy’s lessons on Python.

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inside the function I put in an “if” loop to see if X is an even number but why does the expression need to be
“x % 2 == 0:”
rather than
“x % 2:”.
why should there be a zero.

I’m printing out ODD or EVEN just to test the code but when I input either an even or odd number, it outputs the correct answer then the opposite of that as a final answer. I don’t understand why it’s doing this. What am I doing wrong?

is_even should be returning a boolean. This is what we refer to as a predicate function.

def is_even(num):
    return num % 2 == 0
def is_odd(num):
    return num % 2 != 0

And so the program logic would be,

if is_even(4):
    print ("Even")
    print ("Odd")

As we can see, the second function is not even needed (no pun intended).