How to generically transform a list?
arambo314 at hotmail.com
Fri Aug 27 04:41:14 CEST 2004
As simple as
newList=[[item[index] for index in returnList] for item in theList]
> Suppose you have a list of lists:
> theList = [['a',1,11,'aa'], ['b',2,22,'bb'],['c',3,33,'cc']]
> I would like to have a GENERIC way how to turn this list of list into
> another list of list.
> - A user can choose which columns she wants
> - A user can select the order of the columns
> For example:
> The user wants columns: 1,2
> The user wants it to be ordered: 2,1
> A non generic approach would maybe do the following:
> >>> theList = [['a',1,11,'aa'], ['b',2,22,'bb'],['c',3,33,'cc']]
> >>> new_list = [[row, row] for row in theList]
> >>> new_list
> [[11, 1], [22, 2], [33, 3]]
> I am sure there must be a rather elegant generic approach, which is
> lurking somewhere to be realeased.
> Thanks for any hint in advance,
More information about the Python-list