corrected version, should work :-D

import time
from socket import socket, AF_INET, SOCK_STREAM, timeout as socket_timeout
from threading import Thread


class Client:
    QUIT = "{quit}"

    def __init__(self, name, host="localhost", port=5500, buffer_size=1024, timeout=5):
        self.connected = False
        self.running = False
        self.name = name
        self.addr = (host, port)
        self.buffer_size = buffer_size
        self.socket = socket(AF_INET, SOCK_STREAM)
        self.socket.settimeout(timeout)
        self.socket.connect(self.addr)
        self.connected = True
        self.running = True
        self.send_message(name)
        receive_thread = Thread(target=self.receive)
        receive_thread.start()

    def send_message(self, msg):
        if not self.running:
            raise ConnectionError("Client is not running or connected")
        if msg == self.QUIT:
            self.running = False
        sock = self.socket
        try:
            sock.sendall(msg.encode())
        except Exception as e:
            print("Message send failure in client.send_message()")
            print("Exception: ", e)
            self.running = False
            self.connected = False

    def receive(self):
        sock = self.socket
        incoming_message = None
        while self.running:
            try:
                incoming_message = sock.recv(self.buffer_size).decode().rstrip()
                # the rsplit removes whitespace and newline form the
                # right side of the string, makes testing with
                # netcat easier
            except socket_timeout:
                continue
            except Exception as e:
                print(f"Exception {e} in receive method\nstopping loop")
                break
            if not incoming_message or incoming_message == self.QUIT:
                print("Connections was closed or {quit} was received")
                self.running = False
                break
            print(incoming_message)

    def disconnect(self):
        if self.connected:
            self.send_message(self.QUIT)
        else:
            self.running = False


if __name__ == "__main__":
    try:
        client = Client("Testclient\n")
    except Exception as e:
        print(e)
    else:
        for n in range(10):
            client.send_message(f"Hello World {n}\n")
            time.sleep(1)
        client.disconnect()