how to remove the same words in the paragraph

[Peter Otten]

kylin wrote:

> I want to remove all the punctuation and no need words form a string
> datasets for experiment.

> I need to remove the word if it appears in the paragraph twice. could
> some give me some clue or some useful function in the python.

>>> para = u"""I need to remove the word if it appears in the paragraph 
twice. could
... some give me some clue or some useful function in the python.
... """
>>> print "\n".join(sorted(set(para.translate(dict.fromkeys(map(ord, 
".:,-"))).split())))
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