"if not" vs. "!="


So i have learned more about the difference between if not and != but still am confused in my code.
In this case I am going to find the middle 2 numbers in a list and get the average or if the list is odd just get the middle number.

def median(numlist):   
    numlist = sorted(numlist)
    half = len(numlist) // 2
    if not len(numlist) % 2:
        return (numlist[half] + numlist[half - 1]) / 2.0
        return numlist[half]

in the line :

if not len(numlist) % 2:

this one is the correct form and when I do
median([4, 5, 5, 4])
I get 4.5, correct answer.
Why if I use:

if len(numlist) % 2 !=0 :

do i get 5 instead?

Am I correct that —if not len(numlist) % 2:— is saying if the length of numlist is not even…? As in a answer of 0 means true and something else means false? I am missing something on the short hand of some coding I have recently realized…


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