python import socket class from other modules

Question

I have created a class(object) connection_manager using socket TCP in a module (connection.py):

#file connection.py
HOST = "127.0.0.1"  # Standard loopback interface address (localhost)
PORT = 8001        # Port to listen on TCP/IP
PORT1 = 8002       # Port to listen on UDP/IP

class connection_manager(object):
    def creat_tcp_connection(self):
        try:
            self.client_tcp = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            tcp_server_address = (HOST, PORT)
        except:
            print("Serveur TCP Introuvable")
        finally:
            print('Connecting to TCP server:' + str(tcp_server_address))
            self.client_tcp.connect(tcp_server_address)
            print('Connection TCP sucessful')
        return self.client_tcp

Now I want to import this class into test.py to use this socket. So I did:

#file test
import socket
import sys
import connection as cnx

def test_function():
    try:      
        texte = "ABC\n"
        cnx.client_tcp.send(texte.encode())
        data=cnx.client_tcp.recv(1024)
    except:
        print("error occur")    
    finally: 
        print('closing test')
    
if __name__ == "__main__":    
    p1 = cnx.connection_manager()
    test_function()

But It got the error:

AttributeError: 'connection_manager' object has no attribute 'client_tcp'

In the same module, in test_function I can use:

self.client_tcp.send(texte.encode())
data=self.client_tcp.recv(1024).decode('utf-8')

s But in different modules, I don't know how to do it? How can I import the class using socket from this module into another module? Many thanks