Hi All, 

I am trying to do a really simple file operation, yet, it befuddles me...

I have a few hundred .csv files, and to each file, I want to manipulate the 
data, then save back to the original file. The code below will open up the 
files, and do the proper manipulations-- but I can't seem to save the files 
after the manipulation.. 

How can I save the files-- or do I need to try something else maybe with split, 
join, etc..
 

import os
import csv
for filename in os.listdir("/home/matthew/Desktop/pero.ngs/blast"):
        with open(filename, 'rw') as f:
                reader = csv.reader(f)
                for row in reader:
                        print ">",row[0],row[4],"\n",row[1], "\n", ">", row[2], 
"\n", row[3]



Thanks in advance, Matt
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