can we append a list with another list in Python ?

[inshu chauhan]

ok I got it guys...

On Tue, Oct 23, 2012 at 10:08 PM, Joshua Landau
<joshua.landau.ws at gmail.com>wrote:

>  On 23 October 2012 21:06, Joshua Landau <joshua.landau.ws at gmail.com>wrote:
>
>>  On 23 October 2012 21:03, Joshua Landau <joshua.landau.ws at gmail.com>wrote:
>>
>>> On 23 October 2012 12:07, Jean-Michel Pichavant <jeanmichel at 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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