[Tutor] casting string to integer in a list of lists

[Daniel Sarmiento]

I am not an expert and don't know if this is considered 'elegant', but this
is what I would try

conv = [[j[0], int(j[1]), int(j[2])] + j[3:] for j in LoL]


> Hi Your,
>
>  I work with genomic datasets as well and have recently only started
> working with python (so my advice is a bit naive)
>
>  I would say although there may be different ways you can cast an integer
> or float type into your list of lists you may actually no need to do so with
> your starting file/list... ie:
>
>  if for example you want to do stuff with the location chrX with start
> 160944034 and end 160944035
>
>  you could:
> for x in LoL:
> startstring=LoL[1]  #this would be '160944034'
> startint=int(startstring) #this would be 160944034
>
> now if you also use a counter you can iterate and do all sort of
> calculations for different genomic locations.
>
>  I use the csv module and then append into a numpy array that takes type
> float, so you could work with that as well,
>
> cheers
>
>
> Dr Triantafyllos Gkikopoulos
> >>> culpritNr1 <ig2ar-saf1 at yahoo.co.uk> 01/08/09 8:42 PM >>>
>
> Hi All,
>
> Say I have this nice list of lists:
>
> LoL = [['chrX', '160944034', '160944035', 'gnfX.145.788', '63.60'],
>             ['chrX', '161109992', '161109993', 'rs13484104', '63.60'],
>             ['chrX', '161414112', '161414113', 'rs13484105', '63.60'],
>             ['chrX', '161544071', '161544072', 'rs13484106', '63.60'],
>             ['chrX', '162030736', '162030737', 'gnfX.146.867', '67.05'],
>             ['chrX', '164171913', '164171914', 'gnfX.148.995', '70.45']]
>
> Now I want to cast the second and third "columns" from string to integer,
> like this
>
> LoL = [['chrX', 160944034, 160944035, 'gnfX.145.788', '63.60'],
>             ['chrX', 161109992, 161109993, 'rs13484104', '63.60'],
>             ['chrX', 161414112, 161414113, 'rs13484105', '63.60'],
>             ['chrX', 161544071, 161544072, 'rs13484106', '63.60'],
>             ['chrX', 162030736, 162030737, 'gnfX.146.867', '67.05'],
>             ['chrX', 164171913, 164171914, 'gnfX.148.995', '70.45']]
>
> Is there any elegant way to do this? I can't assume that all lines will
> have
> the same number of elements.
>
> Thank you,
>
> Your Culprit
>
>
> --
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> http://www.nabble.com/casting-string-to-integer-in-a-list-of-lists-tp21359600p21359600.html
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>
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