How to combine data taken from server between client and GUI?

[bescf]

show what you've tried

I attached a photo to previous reply. Don't view it ? I'm adding code now.

import socket
 
class client:
    def __init__(self):
        self.HOST = '192.168.1.55'  # The server's hostname or IP address, NodeMCU IP Address
        self.PORT = 80              # The port used by the server, PORT NUMBER in ARDUINO CODE
 
    def transfer_data(self):
        s.connect((HOST, PORT))
        s.sendall(b'Hello, world')
        self.data = s.recv(1024)
 
# To try run stand-alone
if __name__ == '__main__':
    cl = client()
    cl.transfer_data()
    print(cl.data)
    

Error:
            > & "C:/Program Files/Python37/python.exe" c:/Users/User/Desktop/PYQT/client.py
Traceback (most recent call last):
  File "c:/Users/User/Desktop/PYQT/client.py", line 16, in <module>
    cl.transfer_data()
  File "c:/Users/User/Desktop/PYQT/client.py", line 9, in transfer_data
    s.connect((HOST, PORT))
NameError: name 's' is not defined