Hi, I'm following coursera's learn to program: the fundamentals, which teaches programming basics in python. Our first assignement involves the modulo operator with a negative divident, and while I've managed to get to understand it enough for the purposes of the assignement with help from othe rstudents, I still don't know how the hell it works, I wouldn't know how to use modulo in another situation if it ever arised. So, i undertand how modulo works when only positive numbers are used, but how does modulo determine, that, say -15 % 14 is equal to 13? Or -20 % 100 is 20? I just don't get how modulo works, all explanations I've found online only seem to be in relation of how this applies to perl or something, can someone explain it to me?
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