[Tutor] how to select a column from all files in one directory?

[John Purser - Gmail]

Morning Kumar,

This worked for me:
###Code Start###
import os
path = 'C:\\Documents and Settings\\WHOEVER\\My Documents\\temp\\'
files = os.listdir(path)
out = file('output.txt', 'w')

for inFile in files:
	f = file(path + inFile, 'r')
	b = f.readline().split('	')	#There's a tab in there, not spaces
	if len(b) >= 3:
		out.write(b[3] + '\n')
	f.close()

out.close()

###Code End###


I'd give the output file an output directory of it's own to be sure I didn't
clobber anything and of course those are windows directory seperators.

John Purser

-----Original Message-----
From: tutor-bounces at python.org [mailto:tutor-bounces at python.org]On
Behalf Of kumar s
Sent: Tuesday, November 23, 2004 05:38
To: tutor at python.org
Subject: [Tutor] how to select a column from all files in one directory?


Dear group,
 I have ~40 tab-delimitted text files in one
directory. I have to select 4th column from all these
files and write it into a single tab delimitted text
file. How can I do this in python.

I read a prev. post on tutor and tried the following:

>>files = listdir('path')

This returns the files(file names) in the directory as
a list. However, I need the 4th column from all the
files in the directory.

Can you please help me.

Thank you.

-kumar

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