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From: Gisle Vanem <gvanem@broadpark.no>
To: Python-list <python-list@python.org>
References: <db8edd31-78f2-4e8c-a6bd-37e1e83ff2ee@googlegroups.com>
Subject: Re: Question about nested loop
Date: Mon, 31 Dec 2012 12:25:16 +0100
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Xref: csiph.com comp.lang.python:35848

"Isaac Won" <winefrog@gmail.com> wrote:

> while c < 10:
>        c = c + 1
> 
>        for  columns in ( raw.strip().split() for raw in f ):
> 
> 
>                b.append(columns[c])
> 
>        y = np.array(b, float)
>        print c, y
> 
> 
> I thought that  can get the arrays of the columns[5] to [10],
> but I only could get repetition of same arrays of columns[5].

I don't pretend to know list comprehension very well, but 
'c' isn't incremented in the inner loop ( .. for raw in f). 
Hence you only append to columns[5].

Maybe you could use another 'd' indexer inside the inner-loop?
But there must a more elegant way to solve your issue. (I'm a
PyCommer myself).

--gv