Stein's GCD according to given pseudo code

[wanttolearn]

My thought process for using while loops was that if either x or y was even, I would want to keep dividing it by 2 till the point that it would be an odd number.
I changed my code to using if and elif conditions and it worked now. I forgot that using if conditions in a while loop will cause the if conditions to loop as well.

Thanks for the help!