from netmiko import ConnectHandler

def run_commands(host, user, pw, command, device_type="cisco_nxos"):
    """
    Executes a commands on a device
    :param host: IP/hostname
    :param user: username to login to the switch
    :param pw:  password to login to the switch
    :param command: list of commands to execute on each device
    :param device_type: netmiko device type
    :return:
    """
    device = {"device_type": device_type,
              "ip": host.rstrip(),
              "username": user,
              "password": pw,
              }

    session = ConnectHandler(**device)
    output = session.send_command(command)
    return output

hosts = ['1.1.1.1', '2.2.2.2']

for h in hosts:
    unsaved_changes = run_commands(h, 'cisco', 'cisco', 'show running-config diff')
    if len(unsaved_changes) > 1:
        print("unsaved changes on {}".format(h))
        # potentially save automatically, or record delta's, etc?