def handler(title, instructions, fields):
    if len(fields) > 1:
        raise sftp.SSHException("Expecting one field only.")
    return [password]


def create_sftp_client():
    #from transport object

    sftp.util.log_to_file("paramiko", level="DEBUG")

    transport = sftp.Transport(('myhost', 2222), default_max_packet_size=10000,
                               default_window_size=10000)
    transport.connect(username='myuser', password='mypassword')
    transport.auth_interactive(username, handler)
    channel = transport.open_channel("session")
    channel.invoke_shell()
    channel.send('ls\n')

    return channel