python - TypeError argument must be an int or have a fileno() method

Question

Seen here https://stackoverflow.com/search?q=TypeError+argument+must+be+an+int+or+have+a+fileno%28%29+method

But just can't quite find my answer. I am trying out a chat script

Server side runs perfectly fine.

# chat_server.py
 
import sys
import socket
import select

HOST = 'localhost' 
SOCKET_LIST = []
RECV_BUFFER = 4096 
PORT = 9009

def chat_server():

    server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    server_socket.bind((HOST, PORT))
    server_socket.listen(10)
 
    # add server socket object to the list of readable connections
    SOCKET_LIST.append(server_socket)
 
    print("Chat server started on port " + str(PORT))
 
    while 1:

        # get the list sockets which are ready to be read through select
        # 4th arg, time_out  = 0 : poll and never block
        ready_to_read,ready_to_write,in_error = select.select(SOCKET_LIST,[],[],0)
      
        for sock in ready_to_read:
            # a new connection request recieved
            if sock == server_socket: 
                sockfd, addr = server_socket.accept()
                SOCKET_LIST.append(sockfd)
                print("Client (%s, %s) connected" % addr)
                 
                broadcast(server_socket, sockfd, "[%s:%s] entered our chatting room
" % addr)
             
            # a message from a client, not a new connection
            else:
                # process data recieved from client, 
                try:
                    # receiving data from the socket.
                    data = sock.recv(RECV_BUFFER)
                    if data:
                        # there is something in the socket
                        broadcast(server_socket, sock, "
" + '[' + str(sock.getpeername()) + '] ' + data)  
                    else:
                        # remove the socket that's broken    
                        if sock in SOCKET_LIST:
                            SOCKET_LIST.remove(sock)

                        # at this stage, no data means probably the connection has been broken
                        broadcast(server_socket, sock, "Client (%s, %s) is offline
" % addr) 

                # exception 
                except:
                    broadcast(server_socket, sock, "Client (%s, %s) is offline
" % addr)
                    continue

    server_socket.close()
    
# broadcast chat messages to all connected clients
def broadcast (server_socket, sock, message):
    for socket in SOCKET_LIST:
        # send the message only to peer
        if socket != server_socket and socket != sock :
            try :
                socket.send(message)
            except :
                # broken socket connection
                socket.close()
                # broken socket, remove it
                if socket in SOCKET_LIST:
                    SOCKET_LIST.remove(socket)
 
if __name__ == "__main__":

    sys.exit(chat_server())

But client

import sys
import socket
import select
 
def chat_client():

    host = "127.0.0.1"
    port = 9009
     
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.settimeout(2)
     
    # connect to remote host
    try :
        s.connect((host, port))
    except :
        print('Unable to connect')
        sys.exit()
     
    print('Connected to remote host. You can start sending messages')
    sys.stdout.write('[Me] '); sys.stdout.flush()
     
    while 1:
        socket_list = [sys.stdin, s]
        potential_errs=[]
        
        # Get the list sockets which are readable
        ready_to_read,ready_to_write, in_error = select.select(socket_list , host, int(1))
         
        for sock in ready_to_read:             
            if sock == s:
                # incoming message from remote server, s
                data = sock.recv(4096)
                if not data :
                    print('
Disconnected from chat server')
                    sys.exit()
                else :
                    #print data
                    sys.stdout.write(data)
                    sys.stdout.write('[Me] '); sys.stdout.flush()     
            
            else :
                # user entered a message
                msg = sys.stdin.readline()
                s.send(msg)
                sys.stdout.write('[Me] '); sys.stdout.flush() 

if __name__ == "__main__":

    sys.exit(chat_client())

Has run from cmd, not IDLE because of issues (read something about it relating to my issue)

Traceback

line 50 in module

    sys.exit(chat_client())

line 28 in chat_client

    ready_to_read,ready_to_write, in_error = select.select(socket_list , host, int(1))

TypeError: argument must be an int or have a fileno() method

Answer 1

select doesn't work with non-socket objects on Windows. For more information see the documentation about select.select, where it mentions that:

File objects on Windows are not acceptable, but sockets are. On Windows, the underlying select() function is provided by the WinSock library, and does not handle file descriptors that don’t originate from WinSock.