[Tutor] Something is wrong in file input output functions.

[kumar s]

Dear group,
I have written a small piece of code that takes a file
and selects the columns that I am interested in and
checks the value of the column on a condition (value
that eqauls 25) and then write it the to another file.



Code:
import sys
from string import split
import string
print "enter the file name" ### Takes the file name###
psl = sys.stdin.readline()  ### psl has the file
object###

f2 = sys.stdout.write("File name to write")
def extCor(psl):
''' This function, splits the file and writes the
desired columns to
to another file only if the first column value equals
25.'''
    str_psl = psl.split('\n')
    str_psl = str_psl[5:]
    for ele in range(len(str_psl)):
        cols = split(str_psl[ele],'\t')
        des_cols =
cols[0]+'\t'+cols[1]+'\t'+cols[8]+'\t'+cols[9]+'\t'+cols[11]+'\t'+cols[12]+'\t'+cols[13]+'\t'+cols[15]+'\t'+cols[16]+'\t'+cols[17])
	if cols[0] == 25:
            '''This condition checks if the first
column value == 25, then it writes it to the file, if
not then it does not'''
            f2.write(des_cols)
            f2.write("\n")

extCor(psl)



Question:
when i give it the file name that it should parse, I
do not get to asked the file name i am interested in
it gives me nothing. Please help me. 
Thanks
K


		
__________________________________ 
Do you Yahoo!? 
The all-new My Yahoo! - Get yours free! 
http://my.yahoo.com