how to remove duplicated elements in a list?

Alex Martelli aleax at mail.comcast.net
Mon Dec 19 17:48:13 CET 2005


Brian van den Broek <broek at cc.umanitoba.ca> wrote:
   ...
> >>> orig_list = [3,1,2,3,1,2,3,1,2,1,2,1,3]
> >>> new_list = list(set(orig_list))
> >>> new_list.sort(cmp= lambda x,y: cmp(orig_list.index(x), 
> orig_list.index(y)))
> >>> new_list
> [3, 1, 2]
> >>>

A better way to exploit exactly the same idea is to use:

new_list.sort(key=orig_list.index)


Alex



More information about the Python-list mailing list