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The method of insert doesn't work with nltk texts:　AttributeError: 'ConcatenatedCorpusView' object has no attribute 'insert'

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I wrote codes to add 'like' at the end of every 3 word in a nltk text as follows:

>>> text = nltk.corpus.brown.words(categories = 'news')
>>> def hedge(text):
	for i in range(3,len(text),4):
		new_text = text.insert(i, 'like')
	return new_text[:50]

>>> hedge(text)

Traceback (most recent call last):
  File "<pyshell#77>", line 1, in <module>
    hedge(text)
  File "<pyshell#76>", line 3, in hedge
    new_text = text.insert(i, 'like')
AttributeError: 'ConcatenatedCorpusView' object has no attribute 'insert'

Isn't text in the brown corpus above a list? why doesn't it has attribute 'insert'?

Thanks much for your hints.

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The method of insert doesn't work with nltk texts:　AttributeError: 'ConcatenatedCorpusView' object has no attribute 'insert' Token Type <typetoken@gmail.com> - 2012-09-02 02:39 -0700
  Re: The method of insert doesn't work with nltk texts:　AttributeError: 'ConcatenatedCorpusView' object has no attribute 'insert' Dave Angel <d@davea.name> - 2012-09-02 07:10 -0400
  Re: Fwd: The method of insert doesn't work with nltk texts: AttributeError: 'ConcatenatedCorpusView' object has no attribute 'insert' Dave Angel <d@davea.name> - 2012-09-02 09:51 -0400
  Re: The method of insert doesn't work with nltk texts:　AttributeError: 'ConcatenatedCorpusView' object has no attribute 'insert' Peter Otten <__peter__@web.de> - 2012-09-02 16:12 +0200

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