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

[kumar s]

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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