set the hostname of a remote host

set_hostname.py

import paramiko, re, time, sys
def ssh_to_target (hostname, username, password):
    client = paramiko.SSHClient()
    client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    client.connect(hostname, username=username, password=password)
    return client
 
def set_hostname(client, password, cmds):
    for cmd in cmds:
        transport = client.get_transport()
        session = transport.open_session()
        session.set_combine_stderr(True)
        session.get_pty()
        session.exec_command(cmd)
        stdin = session.makefile('wb', -1)
        stdout = session.makefile('rb', -1)
        #you have to check if you really need to send password here 
        stdin.write(password +'\n')
        stdin.flush()

def perform_set_hostname(user, password, host, new_hostname):
    echo_hostname = '''sudo sh -c "echo '%s' > /etc/hostname"'''%(new_hostname)
    cmd_list = [
      echo_hostname,
    ]
    client = ssh_to_target(host, username=user, password=password)
    setup_nfs (client, password, cmd_list)

    
if __name__ == "__main__":
    if len(sys.argv) < 5:
      cmd = "%s <host_update> <user> <password> <new_hostname>"%sys.argv[0]
      sys.exit(-1)
    host = sys.argv[1]
    user = sys.argv[2]
    password = sys.argv[3]
    new_hostname = sys.argv[4]
    perform_set_hostname(user, password, host, new_hostname)