On Apr 14, 5:36 pm, "Dropkick Punt" <[EMAIL PROTECTED]> wrote: > Hi. I have a list of common prefixes: > > >>> prefixes = [ "the", "this", "that", "da", "d", "is", "are", "r", "you", > >>> "u"] > > And I have a string, that I split() into a list. > > >>> sentence = "what the blazes is this" > >>> sentence = sentence.split() > > Now I want to strip the sentence of all words in the prefix list. > > I tried this method: > > >>> for x in prefixes: > > ... if sentence.index(x): > ... del sentence[sentence.index(x)] > > This raises, the error: > > Traceback (most recent call last): > File "<stdin>", line 3, in ? > ValueError: list.index(x): x not in list > > This puzzles me, because if x isn't in the list, the subroutine shouldn't > attempt to delete it > from the list, so I'm not sure why it's complaining. > > Can anybody explain this to me, &/or show me a better way to do it?
>>> prefixes = [ "the", "this", "that", "da", "d", "is", "are", "r", "you", "u"] >>> sentence = "what the blazes is this" >>> sentence = sentence.split() >>> sentence ['what', 'the', 'blazes', 'is', 'this'] >>> set(sentence).difference(prefixes) set(['what', 'blazes']) -- http://mail.python.org/mailman/listinfo/python-list
