read a files particular line

[Frank Grellert]

Hi,
does anybody have an idea how to read a particular line of a file like awk's
awk '{if( NR==12) print $0}' filename (reads lineno 12 of filename)

thanks for your help

Frank Grellert

[Kristóf Stróbl]

Hi,

If the file is not too big use:

file("filename").readlines()[11]

Kristóf

Frank Grellert wrote:

Hi,
does anybody have an idea how to read a particular line of a file like awk's
awk '{if( NR==12) print $0}' filename (reads lineno 12 of filename)

thanks for your help

Frank Grellert

[Peter L Hansen]

Kristóf Stróbl wrote (top-posting, but I fixed it. You're welcome.):

Frank Grellert wrote:

does anybody have an idea how to read a particular line of a file
like awk's awk '{if( NR==12) print $0}' filename (reads lineno 12 of
filename)

If the file is not too big use:

file("filename").readlines()[11]

And if the file is "too big", there's always iterators:

print itertools.islice(open('tempx.txt'), 11, 12).next()

A little more complicated, but avoids reading the entire file
into memory.

-Peter

[Miki Tebeka]

Hello Frank,

Hi,
does anybody have an idea how to read a particular line of a file like awk's
awk '{if( NR==12) print $0}' filename (reads lineno 12 of filename)

Check the documentation about the "linecache".

HTH.
--
------------------------------------------------------------------------
Miki Tebeka <mi*********@gmail.com>
http://tebeka.spymac.net
The only difference between children and adults is the price of the toys

[Michael Hudson]

Frank Grellert <fg*******@t-online.de> writes:

Hi,
does anybody have an idea how to read a particular line of a file like awk's
awk '{if( NR==12) print $0}' filename (reads lineno 12 of filename)

for lineno, line in enumerate(open_file):
# lineno starts at 0, though

Cheers,
mwh

--
<radix> I feel so special when people quote me
-- from Twisted.Quotes

[Alex Martelli]

Frank Grellert <fg*******@t-online.de> wrote:

does anybody have an idea how to read a particular line of a file like awk's
awk '{if( NR==12) print $0}' filename (reads lineno 12 of filename)

Standard Python library module linecache, which others suggested, is
your best bet. itertools.islice(open('filename'), 12, 13).next() should
also work (after an 'import itertools' of course, since it, too, is a
module in the standard library) and might be faster if you'll never need
to get any other line from that file in the course of your program.
Alex