reading a specific column from file

[Reedick, Andrew]

> -----Original Message-----
> From: python-list-bounces+jr9445=att.com at python.org [mailto:python-
> list-bounces+jr9445=att.com at python.org] On Behalf Of Ivan Novick
> Sent: Friday, January 11, 2008 12:46 PM
> To: python-list at python.org
> Subject: Re: reading a specific column from file
> 
> 
> You say you would like to "read" a specific column.  I wonder if you
> meant read all the data and then just seperate out the 3rd column or
> if you really mean only do disk IO for the 3rd column of data and
> thereby making your read faster.  The second seems more interesting
> but much harder and I wonder if any one has any ideas.  

Do what databases do.  If the columns are stored with a fixed size on
disk, then you can simply compute the offset and seek to it.  If the
columns are of variable size, then you need to store (and maintain) the
offsets in some kind of index.



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