[Python] Python try/except not working

Trying to get the try/except statement working but having problems. This code will take a txt file and copy the file that is in location row 0 to location of row 1. It works however if i change one of the paths to invalid one it generates an error ftplib.error_perm however the except command is not picking up and everything stops. What am i doing wrong? Python 2.4

import csv
import operator
import sys
import os
import shutil
import logging
import ftplib
import tldftp

def docopy(filename):
ftp = tldftp.dev()
inf = csv.reader(open(filename,'r'))
sortedlist = sorted(inf, key=operator.itemgetter(2), reverse=True)
for row in sortedlist:
src = row[0]
dst = row[1]
tldftp.textXfer(ftp, "RETR " + src, dst)


def hmm(haha):
result = docopy(haha);
try:
it = iter(result)
except ftplib.error_perm:
print "Error Getting File"


if __name__ == "__main__":
c = sys.argv[1]
if (c == ''):
raise Exception, "missing first parameter - row"
hmm(c)

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