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From: Matteo Landi on 12 Jul 2010 16:34
I hope this could help:

>>> f = open('powersave.sh')
>>> map(lambda s: s.strip(), f.readlines())
['echo 1 > /sys/module/snd_hda_intel/parameters/power_save', 'echo
min_power > /sys/class/scsi_host/host0/link_power_management_policy',
'echo 1 > /sys/module/snd_hda_intel/parameters/power_save']

I know for sure someone else will address you to other better solutions :)

On Mon, Jul 12, 2010 at 10:27 PM, Jia Hu <hujia06(a)gmail.com> wrote:
> Hi, I just want to delete "\n" at each line. My operating system is ubuntu
> 9.1. The code is as follows
>
> #!/usr/bin/python
> import string
> fileName=open('Direct_Irr.txt', 'r') # read file
> directIrr = fileName.readlines()
> fileName.close()
> for line in directIrr:
>        line.rstrip('\n')
> print directIrr
>
> But I found there is still "\n" . Could someone help me why it is not
> correct?
>
> Thank you
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>



--
Matteo Landi
http://www.matteolandi.net/
From: Ian Kelly on 12 Jul 2010 16:38
On Mon, Jul 12, 2010 at 2:27 PM, Jia Hu <hujia06(a)gmail.com> wrote:
> Hi, I just want to delete "\n" at each line. My operating system is ubuntu
> 9.1. The code is as follows
>
> #!/usr/bin/python
> import string
> fileName=open('Direct_Irr.txt', 'r') # read file
> directIrr = fileName.readlines()
> fileName.close()
> for line in directIrr:
>        line.rstrip('\n')
> print directIrr
>
> But I found there is still "\n" . Could someone help me why it is not
> correct?

The print statement automatically adds a newline to each line. If you
want the lines written verbatim, use sys.stdout.write(line)
From: Chris Rebert on 12 Jul 2010 16:45
On Mon, Jul 12, 2010 at 1:27 PM, Jia Hu <hujia06(a)gmail.com> wrote:
> Hi, I just want to delete "\n" at each line. My operating system is ubuntu
> 9.1. The code is as follows
>
> #!/usr/bin/python
> import string
> fileName=open('Direct_Irr.txt', 'r') # read file
> directIrr = fileName.readlines()
> fileName.close()
> for line in directIrr:
>        line.rstrip('\n')
> print directIrr
>
> But I found there is still "\n" . Could someone help me why it is not
> correct?

..rstrip() returns a *new* string without trailing whitespace (which
you are currently then throwing away); it does *not* modify string
objects in-place. Python strings objects are entirely immutable and
unmodifiable; all operations on them merely produce /new/ strings.

Assuming you still want to use .readlines(), you'd do:
directIrr = fileName.readlines()
fileName.close()
directIrr = [line.rstrip('\n') for line in directIrr]
print directIrr

For how third line works, google "python list comprehensions".

Cheers,
Chris
--
http://blog.rebertia.com
From: python on 12 Jul 2010 17:29
Jia,

print ''.join( open( 'Direct_Irr.txt' ).read().split() )

Broken out:

- open(): open file
- read(): read its entire contents as one string
- split(): split the contents into a list of lines
(splits lines at \n; does not include \n in split values)
- ''.join(): join list of lines with an empty char

Malcolm
From: Thomas Jollans on 12 Jul 2010 17:36
On 07/12/2010 11:29 PM, python(a)bdurham.com wrote:
> Jia,
>
> print ''.join( open( 'Direct_Irr.txt' ).read().split() )
>
> Broken out:
>
> - open(): open file
> - read(): read its entire contents as one string
> - split(): split the contents into a list of lines
> (splits lines at \n; does not include \n in split values)

also splits at other whitespace.

> - ''.join(): join list of lines with an empty char
>
> Malcolm

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