Wow, well said. I love how you coded this:

for i in map(int, input().split()):
    values['positive'*(not i) + 'negative'*(i<0) + 'zeros'*(i>0)] += 1

Edit: it seems like you made a mistake, if 'i>0' zeroes will increase with 1. if i=0 positive will increase with 1

You need to swap the statements 'not i' and 'i>0'