Adding a column in a tab delimited txt file

[Harald Massa]

... 20 columns, now I need to add another column of zero at the 4th 
column
position and a column of zero at the 9th column position. What is the


import csv

reader = csv.reader(open("sample.csv"))
writer = csv.writer(open("sample2.csv","w")

for data in reader:
    	writer.writerow([data[:4]+[0]+data[4:7]+[0]+data[7:])



http://online.effbot.org/2003_08_01_archive.htm#librarybook-csv-module


Maybe optimization with the list concatenation is possible. But first 
test, if it is not fast enough.

(csv is included with python 2.3, is available seperately in the internet 
for 2.2 also)

Harald