chris.py

# -*- coding: utf-8 -*-
from collections import namedtuple

from ranking import Ranking


Player = namedtuple('Player', ['score', 'weight'])
players = [Player(100, 1), Player(80, 1), Player(80, 2.5), Player(80, 2.5),
           Player(70, 1), Player(60, 1.5), Player(60, 1.5)]


def weighted(ranking):
    cumulated_weight = 0
    effective_cumulated_weight = 0
    prev_rank = None
    for rank, player in ranking:
        if prev_rank != rank:
            effective_cumulated_weight = cumulated_weight
        yield rank + effective_cumulated_weight, player
        prev_rank = rank
        cumulated_weight += player.weight - 1


for rank, player in weighted(Ranking(players, key=lambda p: p.score)):
    print rank, player


# output:
# 0 Player(score=100, weight=1)
# 1 Player(score=80, weight=1)
# 1 Player(score=80, weight=2.5)
# 1 Player(score=80, weight=2.5)
# 7.0 Player(score=70, weight=1)
# 8.0 Player(score=60, weight=1.5)
# 8.0 Player(score=60, weight=1.5)