You can use a defaultdict to order the items and then convert that back again to a nested list: >>> from collections import defaultdict >>> d = defaultdict(list) >>> for i in x: ... d[i[0]].extend(i[1:]) ... >>> d defaultdict(<type 'list'>, {'NM100': [3, 4, 5, 6, 7, 10, 11, 12, 13], 'NM200': [15, 16, 17]}) >>> z = [ [k] + v for k,v in d.items() ] >>> z [['NM100', 3, 4, 5, 6, 7, 10, 11, 12, 13], ['NM200', 15, 16, 17]]
--- Check my blog! http://wrongsideofmemphis.wordpress.com On Tue, Jul 27, 2010 at 2:32 PM, Vikram K <kpguy1...@gmail.com> wrote: > Suppose i have this nested list: > > >>> x > [['NM100', 3, 4, 5, 6, 7], ['NM100', 10, 11, 12, 13], ['NM200', 15, 16, > 17]] > >>> for i in x: > ... print i > ... > ['NM100', 3, 4, 5, 6, 7] > ['NM100', 10, 11, 12, 13] > ['NM200', 15, 16, 17] > >>> > > how do i obtain from the above the following nested list: > > >>> z > [['NM100', 3, 4, 5, 6, 7, 10, 11, 12, 13], ['NM200', 15, 16, 17]] > >>> for i in z: > ... print i > ... > ['NM100', 3, 4, 5, 6, 7, 10, 11, 12, 13] > ['NM200', 15, 16, 17] > >>> > > _______________________________________________ > python-uk mailing list > python-uk@python.org > http://mail.python.org/mailman/listinfo/python-uk > >
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