Delete first line from file

Alex Stapleton alexs at advfn.com
Tue Mar 1 14:00:23 CET 2005


except them memory usage > file size

at least make sure you do it all on disk :P

# i so tested this first, honest
f = open('file', 'r')
fw = open('file.tmp' ,'w')

lc = 0
for l in f:
	if lc != 0:
		fw.write(l)
	else:
		lc = 1
f.close()
fw.close()

import os
os.rename('file.tmp', 'file')


-----Original Message-----
From: python-list-bounces+alexs=advfn.com at python.org
[mailto:python-list-bounces+alexs=advfn.com at python.org]On Behalf Of
Pieter Claerhout
Sent: 01 March 2005 12:51
To: python-list at python.org
Subject: Re: Delete first line from file


what about the following?

f = open( 'file.txt', 'r' )
lines = f.readlines()
f.close()

f = open( 'file.txt'.'w' )
f.write( '\n'.join( lines[1:] ) )
f.close()

cheers,


pieter

On Tue, 1 Mar 2005 12:42:00 +0000, Peter Nuttall
<p.s.nuttall at durham.ac.uk> wrote:
> On Tue, Mar 01, 2005 at 01:27:27PM +0100, Tor Erik S?nvisen wrote:
> > Hi
> >
> > How can I read the first line of a file and then delete this line, so
that
> > line 2 is line 1 on next read?
> >
> > regards
> >
> >
>
> I think you can do something like:
>
> n=false
> f=file.open("") #stuff here
> g=[]
> for line in f.readlines():
>        if n: g.append(line)
>        n=true
>
> #write g to file
>
> if you are on a unix box, then using the standard untils might be a
> better idea.
>
> Pete
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


--
pieter claerhout . pieter at yellowduck.be . http://www.yellowduck.be/
--
http://mail.python.org/mailman/listinfo/python-list




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