appending into a list

Ricardo Aráoz ricaraoz at gmail.com
Wed Oct 31 17:49:01 CET 2007


Beema shafreen wrote:
> hi everybody,
>                   I have a file :
>    A                     B              C                     D       E
>             
>  2717353      2717412    A_16_P03641964    214    -59
>   2717626      2717685    A_16_P41563655    25    -59
>   2717710      2717754    A_16_P03641965    1250    -44
>   2719004      2719063    A_16_P03641966    -36    -59
>   2719027      2719086    A_16_P21360229    289    -59
>   2719375      2719428    A_16_P03641967    60    -53
>   2719488      2719542    A_16_P21360231    418    -54
>   2719960      2720014    A_16_P03641968    727    -54
>   2720741      2720786    A_16_P03641969    494    -45
>   2721280      2721339    A_16_P03641970    -28    -59
>   2721311      2721370    A_16_P21360234    150    -59
>   2721520      2721569    A_16_P21360235    199    -49
>   2721768      2721821    A_16_P03641971    139    -53
>   2721960      2722004    A_16_P21360237    312    -44
> I need to append the column D and E into a list:
>                             in such a way that the list should have 
> [D,E,D,E,D,E........]
> How do i do it.
> 
> regards
> shafreen
> 

>>> r = []
>>> for D, E in (i.split()[-2:] for i in open('file')) :
	r.append(D)
	r.append(E)

	
>>> r
['214', '-59', '25', '-59', '1250', '-44', '-36', '-59', '289', '-59',
'60', '-53', '418', '-54', '727', '-54', '494', '-45', '-28', '-59',
'150', '-59', '199', '-49', '139', '-53', '312', '-44']


HTH








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