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From: Gary Herron on 26 Apr 2010 11:14
mannu jha wrote:
> Dear all,
>
> I am new in python, can anyone help me that how can I select two
> column out of 6 column from a file.
> For example if I have file like:
>
> a1 a2 a3 a4 a5 a6
> b1 b2 b3 b4 b5 b6
> c1 c2 c3 c4 c5 c6
> d1 d2 d3 d4 d5 d6
>
> and I want output like:
>
> a1 a4
> b1 b4
> c1 c4
> d1 d4
>
> then how to do
>
> Thanks


Do you know how to open a file, and how to read individual lines from it?

If so, then you can split a line at the spaces into a list by using
fields = line.split()
Then
print fields[0], fields[3]
would do what you ask.



Gary Herron



From: J. Cliff Dyer on 26 Apr 2010 11:14
It depends on what you mean by a column. I assume your data is more
complex than what you've shown us.

If your data is really single words separated by spaces, you can do:

for line in open('file'):
columns = line.split()
return columns[0], columns[3]

If your columns can have spaces within them, or are separated in other
ways, you'll need something else.

Cheers,
Cliff


On Mon, 2010-04-26 at 14:50 +0000, mannu jha wrote:
> Dear all,
>
> I am new in python, can anyone help me that how can I select two
> column out of 6 column from a file.
> For example if I have file like:
>
> a1 a2 a3 a4 a5 a6
> b1 b2 b3 b4 b5 b6
> c1 c2 c3 c4 c5 c6
> d1 d2 d3 d4 d5 d6
>
> and I want output like:
>
> a1 a4
> b1 b4
> c1 c4
> d1 d4
>
> then how to do
>
> Thanks


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