import cx_Oracle
import os

host_file = '''
{} localhost
'''
with open('/tmp/HOSTALIASES', 'w') as hosts_file:
    hosts_file.write(host_file.format(os.uname()[1]))

def lambda_handler(event, context):
    con = cx_Oracle.connect('user_name/password@10.xxx.xxx.xxx:1521/service_name