Correct, however other areas of the application expect an empty list to be present, otherwise I would have used None.
2009/1/26 Matthieu Brucher <matthieu.bruc...@gmail.com> > 2009/1/26 Hanni Ali <hanni....@gmail.com>: > > Yes fair point, but when it's a empty list and new elements are replaced > > with a new list instance it's fine, especially as [[]]*100000 is > > significantly faster than [[] for i in xrange(100000)] as I was > previously > > doing. > > In this case, why do you put a list in it in the first place ? You > could put None, and it would be safer ;) > > > In fact I think that's partly answered my question [[]]*x must create a > list > > of pointers pointing at the same list. Rather than [[] for i in > > xrange(100000)] which must create a list of new separate lists instances. > > Hence the significant difference in speed. > > > > Hanni > > I agree. Less memory allocations and initialization, thus more speed. > > Matthieu > -- > Information System Engineer, Ph.D. > Website: http://matthieu-brucher.developpez.com/ > Blogs: http://matt.eifelle.com and http://blog.developpez.com/?blog=92 > LinkedIn: http://www.linkedin.com/in/matthieubrucher > _______________________________________________ > Numpy-discussion mailing list > Numpy-discussion@scipy.org > http://projects.scipy.org/mailman/listinfo/numpy-discussion >
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