import itertools
import collections
def borda(ballot):
n = len([c for c in ballot if c.isalpha()]) - 1
score = itertools.count(n, step = -1)
result = {}
for group in [item.split('=') for item in ballot.split('>')]:
s = sum(next(score) for item in group)/float(len(group))
for pref in group:
result[pref] = s
return result
def tally(ballots):
result = collections.defaultdict(int)
for ballot in ballots:
for pref,score in borda(ballot).iteritems():
result[pref]+=score
result = dict(result)
return result
ballots = ['A>B>C>D>E',
'A>B>C=D=E',
'A>B=C>D>E',
]
print(tally(ballots))
產生
{'A': 12.0, 'C': 5.5, 'B': 8.5, 'E': 1.0, 'D': 3.0}
這個網站是爲特定的編程問題。總的想法應該是相當明顯的(閱讀線,解析,分配點,總結),所以開始並詢問何時出現問題*實施*步驟。 – 2012-02-11 17:55:25