Actually what I wanted to do is : suppose there are 3 lists :
like for xample : clist = [] an empty list , alist = [1,2,3], blist = [4,5,6] and the I want the result is clist = [ [1,2,3], [4,5,6] ..] then I want to read all the lists in clist one by one like : for item in clist: print item which should print: [1,2,3] [4,5,6] On Tue, Oct 23, 2012 at 10:10 PM, inshu chauhan <insidesh...@gmail.com>wrote: > ok I got it guys... > > > On Tue, Oct 23, 2012 at 10:08 PM, Joshua Landau < > joshua.landau...@gmail.com> wrote: > >> On 23 October 2012 21:06, Joshua Landau <joshua.landau...@gmail.com>wrote: >> >>> On 23 October 2012 21:03, Joshua Landau <joshua.landau...@gmail.com>wrote: >>> >>>> On 23 October 2012 12:07, Jean-Michel Pichavant <jeanmic...@sequans.com >>>> > wrote: >>>> >>>>> ----- Original Message ----- >>>>> >>>>> > Thankyou.. but my problem is different than simply joining 2 lists >>>>> > and it is done now :).... >>>>> >>>>> >>>>> A lot of people though you were asking for joining lists, you >>>>> description was misleading. >>>>> >>>>> I'll take a guess: you want to flatten a list of list. >>>>> "Nested" list comprehensions can do the trick. >>>>> >>>>> aList =[[1,5], [2,'a']] >>>>> [item for sublist in aList for item in sublist] >>>>> >>>>> ... >>>>> [1, 5, 2, 'a'] >>>>> >>>>> I find it rather difficult to read though. >>>> >>>> >>>> We have a library function for this, in the one-and-only itertools. >>>> >>>> >>> listoflists = [list(range(x, 2*x)) for x in range(5)] >>>>> >>> listoflists >>>>> [[], [1], [2, 3], [3, 4, 5], [4, 5, 6, 7]] >>>>> >>> from itertools import chain >>>>> >>> list(chain.from_iterable(listoflists)) >>>>> [1, 2, 3, 3, 4, 5, 4, 5, 6, 7] >>>> >>>> >>>> It does exactly what it says... fast and easy-to-read. >>> >>> >>> Note that I think what he really wanted is to go from >>> >>> a, b, c = [list(x) for x in (range(10), range(11, 20), range(21, 30))] >>> >>> to >>> >>>> list(range(30)) >>> >>> >> UNDO! UNDO! UNDO! >> >> I *meant *to say: >> >> Note that I think what he really wanted is to go from >> >> a, b, c = [list(x) for x in (range(10), range(11, 20), range(21, 30))] >> >> to >> >>> [a, b, c] >> >> >
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