gistfile1.txt

import nltk

text = """The Buddha, the Godhead, resides quite as comfortably in the circuits of a digital computer or the gears of a cycle transmission as he does at the top of a mountain or in the petals of a flower. To think otherwise is to demean the Buddha...which is to demean oneself."""
sentence_re = r'''(?x)
  # abbreviations, e.g. U.S.A. (with optional last period)
  ([A-Z])(\.[A-Z])+\.?
  # words with optional internal hyphens
  | \w+(-\w+)*
  # currency and percentages, e.g. $12.40, 82%
  | \$?\d+(\.\d+)?%?
  # ellipsis
  | \.\.\.
  # these are separate tokens
  | [][.,;"'?():-_`]
'''
toks = nltk.regexp_tokenize(text, sentence_re)
print toks