import nltk

 def freq_sorted(text,ranklimit):

     fd=nltk.FreqDist(text)

     cumulative = 0.0

     for rank, (word,freq) in enumerate(sorted(fd.items(), key=lambda x: (-1*x[1], x[0]))[:ranklimit]):

         cumulative += fd[word] * 100 / fd.N()

         print "%3d %6.2f%% %s" % (rank+1, cumulative, word)

 def test_freq_sorted():

     freq_sorted(nltk.corpus.brown.words(),15)

结果为：

  1   5.00% the

  2  10.00% ,

  3  14.00% .

  4  17.00% of

  5  19.00% and

  6  21.00% to

  7  22.00% a

  8  23.00% in

  9  23.00% that

 10  23.00% is

 11  23.00% was

 12  23.00% for

 13  23.00% ``

 14  23.00% ''

 15  23.00% The

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