You should turn
    off any key agents during testing. The 'force_password' attribute will turn
    off public key authentication. This will only work if the remote SSH server
    is configured to allow password logins. Example of using 'force_password'
    attribute::

            s = pxssh.pxssh()
            s.force_password = True
            hostname = raw_input('hostname: ')
            username = raw_input('username: ')
            password = getpass.getpass('password: ')
            s.login (hostname, username, password)

    `debug_command_string` is only for the test suite to confirm that the string
    generated for SSH is correct, using this will not allow you to do
    anything other than get a string back from `pxssh.pxssh.login()`.
    é