How to install and run "Two Way RTI Proxy Script"?

I’m a newbie around here so I apologise if this post is in the wrong place
I am trying to install and get working the script below but have been unable to get past the first line error. I am assuming the script is syntactically correct and that I am installing it incorrectly.
Can someone tell me if this script should run in a normal python enviroment or does it need home assistant appdaemon?

Any pointers will be much appreciated.

import homeassistant.remote as remote
import socket
api = remote.API('', 'PASSWORD', 443) # ('HA Address', 'HA Password', HA Port)
HOST = ""
PORT = 4999 # Listening Port

# Retrieve input from RTI
# RTI 2-Way driver comand srting syntax examples:
#   ,media_player*select_source*entity_id*media_player.living_room_tv*source*Netflix^
#   ,vacuum*turn_on*entity_id*vacuum.roomba**^
def msg_to_hass(strCommand):
    domain = strCommand.split("*")[0] # HA Domain
    service = strCommand.split("*")[1] # HA Service
    field = strCommand.split("*")[2] # HA Field1
    device = strCommand.split("*")[3] # HA Field1 Value
    field2 = strCommand.split("*")[4] # HA Field2
    device2 = strCommand.split("*")[5] # HA Field2 Value
    data = {}   # initialize dictionary
    data[field] = device # insert field 1 and value into dictionary
    data[field2] = device2 # insert field 2 and value into dictionary
    new_data={k:data[k] for k in data if data[k]} # Remove blank entries from data dictionary and save as new_data
    print(domain, service, new_data) # print domain, service, and data to send to HA
    remote.call_service(api, domain, service, new_data) # send command to HA
    state = remote.get_state(api, device) # request device state from HA
    print(state) # Print state of HA Device
def create_listen_socket(host, port):
    """ Setup the sockets our server will receive connection
    requests on """
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    sock.bind((host, port))
    return sock

def recv_msg(sock):
    """ Wait for data to arrive on the socket, then parse into
    messages using b'\0' as message delimiter """
    data = bytearray()
    msg = ''
    # Repeatedly read 4096 bytes off the socket, storing the bytes
    # in data until we see a delimiter
    while not msg:
        recvd = sock.recv(4096)
        if not recvd:
            # Socket has been closed prematurely
            raise ConnectionError()
        data = data + recvd
        #if b'\0' in recvd:
        if b'^' in recvd:   # ^ is the last character in the message. Strip the starting comma.
            #msg = data.rstrip(b'\0')
            msg = data
    msg = msg.decode('utf-8')
    msg = msg.split(",")[-1]
    return msg.rstrip("^")

def prep_msg(msg):
    """ Prepare a string to be sent as a message """
    msg += '\0'
    return msg.encode('utf-8')

def send_msg(sock, msg):
    """ Send a string over a socket, preparing it first """
    data = prep_msg(msg)

def handle_client(sock, addr):
    """ Receive data from the client via sock and echo it back """
        msg = recv_msg(sock) # Blocks until received complete message
        print('{}: {}'.format(addr, msg))
        #send_msg(sock, msg) # Blocks until sent
    except (ConnectionError, BrokenPipeError):
        print('Socket error')
        handle_client(client_sock, addr)        # loop back to recv_msg
    #     print('Closed connection to {}'.format(addr))
    #     sock.close()

if __name__ == '__main__':
    listen_sock = create_listen_socket(HOST, PORT)
    addr = listen_sock.getsockname()
    print('Listening on {}'.format(addr))

    while True:
        client_sock, addr = listen_sock.accept()
        print('Connection from {}'.format(addr))
        handle_client(client_sock, addr)