Who's been dojo herding a lot recently?

cat-me.py

from __future__ import division, print_function

from collections import defaultdict
from operator import itemgetter

get_values = itemgetter(1)

last_few_herders = """
Nicholas
Gautier
Al
Tim
Tom
Tim
Al
Tom
Gautier
Nicholas
Dan
Tim
Gautier
Nicholas
Tom
Nicholas
Tim
""".strip().splitlines()


scores = defaultdict(int)

for dmonth, herder in enumerate(reversed(last_few_herders), 1):
    score = 1 / (dmonth)
    print('{:2d} {:10s} {:5.1f}%'.format(dmonth, herder, 100*score))
    scores[herder] += score

print()
print("Who's been dojo herding a lot recently?")

total = sum(scores.values())
for herder, score in sorted(scores.items(), key=get_values, reverse=True):
    print('{:.1f}%: {}'.format((100 * score / total), herder))