os.system() is not working in django while working on server centos

import sys,os
sys.stderr = open('/dev/null')
import paramiko
sys.stderr = sys.__stderr__

os.system("echo \'s3\' >> myfile.txt ")  #debug first in ssh2
def ssh2_connect(host, user, pswd, port=22):
    try:
        ssh = paramiko.SSHClient()
        ssh.load_system_host_keys()
        ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
        ssh.connect(host, port, user, pswd)
        return ssh

    except Exception, e:
        return str(e) + "Error. Failed to connect. Wrong IP/Username/Password"


def ssh2_exec(ssh, cmd, sudo=False):
        result = []
        try:
            channel = ssh.get_transport().open_session()
            if sudo:
                channel.get_pty()
        except:
          return result

        stdin = channel.makefile('wb')
        stdout = channel.makefile('rb')

        channel.exec_command(cmd)

        exit_status = channel.recv_exit_status()

        if exit_status == 0:
            for line in stdout:
                result.append(line)
        channel.close()
        return result


def ssh2_close(ssh):
    ssh.close()
    return


def ssh2_copyToFile(ssh, local_file, remote_file):
    sftp = paramiko.SFTPClient.from_transport(ssh.get_transport())
    sftp.put(local_file, remote_file)
    return

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