Bill Pursell wrote:
Some might argue that this is not really doing
it in Python. In fact, I would argue that! But if
you're at a command prompt and you want to
see line 7358, it's much easier to type
% sed -n 7358p
than it is to write the python one-liner.
'sed' is not recognized as an
In message [EMAIL PROTECTED], Fredrik
Lundh wrote:
Bill Pursell wrote:
Some might argue that this is not really doing
it in Python. In fact, I would argue that! But if
you're at a command prompt and you want to
see line 7358, it's much easier to type
% sed -n 7358p
than it is to write
In message [EMAIL PROTECTED], Yi Xing
wrote:
I want to read specific lines of a huge txt file (I know the line #).
Each line might have different sizes. Is there a convenient and fast
way of doing this in Python? Thanks.
file(myfile.txt).readlines()[LineNr]
Convenient, yes. Fast, no. :)
On 16/07/2006 5:16 PM, Fredrik Lundh wrote:
Bill Pursell wrote:
Some might argue that this is not really doing
it in Python. In fact, I would argue that! But if
you're at a command prompt and you want to
see line 7358, it's much easier to type
% sed -n 7358p
aarrbejaysus #1: You *don't*
John Machin wrote:
'sed' is not recognized as an internal or external command,
operable program or batch file.
aarrbejaysus #2: Download the installer from
http://gnuwin32.sourceforge.net/packages/sed.htm
in a way, this kind of advice reminds me of
Hi All,
I want to read specific lines of a huge txt file (I know the line #).
Each line might have different sizes. Is there a convenient and fast
way of doing this in Python? Thanks.
Yi Xing
--
http://mail.python.org/mailman/listinfo/python-list
If the line number of the first line is 0 :
source=open('afile.txt')
for i,line in enumerate(source):
if i == line_num:
break
print line
Pierre
--
http://mail.python.org/mailman/listinfo/python-list
Yi Xing [EMAIL PROTECTED] (YX) wrote:
YX Hi All,
YX I want to read specific lines of a huge txt file (I know the line #). Each
YX line might have different sizes. Is there a convenient and fast way of
YX doing this in Python? Thanks.
Not fast. You have to read all preceding lines.
If you have
Yi Xing wrote:
I want to read specific lines of a huge txt file (I know the line #).
Each line might have different sizes. Is there a convenient and fast
way of doing this in Python? Thanks.
#!/usr/bin/env python
import os,sys
line = int(sys.argv[1])
path = sys.argv[2]
os.system(sed -n %dp
Yi Xing wrote:
Hi All,
I want to read specific lines of a huge txt file (I know the line #).
Each line might have different sizes. Is there a convenient and fast
way of doing this in Python? Thanks.
Yi Xing
I once had to do a lot of random access of lines in a multi gigabyte
log file. I
In [EMAIL PROTECTED], Yi Xing wrote:
I want to read specific lines of a huge txt file (I know the line #).
Each line might have different sizes. Is there a convenient and fast
way of doing this in Python? Thanks.
Don't know how efficient the `linecache` module in the standard library is
Pierre Quentel:
If the line number of the first line is 0 :
source=open('afile.txt')
for i,line in enumerate(source):
if i == line_num:
break
print line
I don't know if something like this can be called an improvement:
from itertools import islice
afile = file('data.txt')
Yi,
Use the linecache module. The documentation states that :
The linecache module allows one to get any line from any file, while
attempting to optimize internally, using a cache, the common case where
many lines are read from a single file.
import linecache
linecache.getline('/etc/passwd', 4)
On 16/07/2006 2:54 PM, Nick Vatamaniuc top-posted:
Yi,
Use the linecache module.
Yi, *don't* use the linecache module without carefully comparing the
documentation and the implementation with your requirements.
You will find that you have the source code on your computer -- mine
(Windows
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