Sample script on how to use Python's csv DictReader class to process tabular data.

process_csv.py

#!/usr/bin/env python

import csv

source_file = open('/path/to/Testfile.txt','rb')

# Use the DictReader class to read in your data. This class allows you to access 
# field names by name. It assumes the first line in the file contains the field names

for line in csv.DictReader(source_file, delimiter='\t'):
    net_income = line['net_income'].strip().replace('(','-').replace(')','')
    bank_name = line['name'].strip()
    # process other fields as necessary, and then print them to shell
    print bank_name, net_income