Python Typewriter effect in Telnet

pyTypingCinemaTelnetV2.py

#!/usr/bin/python3

#########################################
#            Made by sl4v               #
#      Licensed under the WTFPL,        #
# see http://www.wtfpl.net/txt/copying/ #
#########################################

import sys
import socket
from time import sleep
from threading import Thread

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

filenames = []
# if you doing this locally, then maybe put a lower number in here
wait_before_each_char = 0.1
host = ''
port = 42069
max_users_connected = 10


def serverMain():
    print("[INFO] Binding to *:" + str(port))
    try:
        s.bind((host, port))
    except Exception as e:
        print("[ERROR] Failed to bind: " + str(e))
    try:
        s.listen(max_users_connected)
        print("[INFO] Server listening.")
    except Exception as e:
        print("[ERROR] Failed to listen: " + str(e))
    while True:
        conn, addr = s.accept()
        print("[INFO] CLIENT CONNECTED FROM " + addr[0] + ":" + str(addr[1]))
        Thread(target=clientThread, args=(conn,)).start()


def genLoginMsg():
    login_msg = 'pyTypingCinemaTelnet V2\r\n\r\n'
    filename_num = 0
    for filename in filenames:
        login_msg += "[" + str(filename_num) + "] - " + \
            filenames[filename_num] + '\r\n'
        filename_num += 1
    login_msg += "\r\nEnter the number of the text file to read from:"
    return login_msg


def clientThread(client):
    client.send(genLoginMsg().encode())
    filename_num = client.recv(1024).decode().replace(
        '\r\n', '\r').replace('\r', '').replace('\n', '')
    filename = ''
    try:
        filename_num = int(filename_num)
        filename = filenames[filename_num]
    except ValueError:
        client.send('Not a valid number, Goodbye.'.encode())
        return 0
    except IndexError:
        client.send('Not a valid number, Goodbye.'.encode())
        return 0
    # if anything besides CRLF is used, replace it with CRLF.
    file_chars = open(filename, 'r').read().replace(
        '\r', '\r\n').replace('\r\n', '\n').replace('\n', '\r\n')
    try:
        client.send('\r\n'.encode())
        for file_char in file_chars:
            client.sendall(file_char.encode())
            sleep(wait_before_each_char)
        return 0  # if a value is returned, the function quits, and thats what we want to do: disconnect the client by exiting this function
    except Exception as e:
        print(str(e))


if __name__ == "__main__":
    for arg_num in range(1, len(sys.argv)):
        arg = sys.argv[arg_num]
        if arg == '-w':
            wait_before_each_char = float(sys.argv[arg_num + 1])
        elif arg == '-f':
            filenames.append(sys.argv[arg_num + 1])
        elif arg == '-m':
            max_users_connected = int(sys.argv[arg_num + 1])
        elif arg == '-p':
            port = int(sys.argv[arg_num + 1])
        elif arg == '-h' or arg == '--help':
            print("""\
usage: pyTypingCinemaTelnet [flag1] [flag1 arg]
-h          show this help menu and quit
-w [time]   how much time (in seconds) to wait before each char, decimals are also allowed
-f [file]   file to read from (can be used multiple times)
-m [users]  max users that can connect to the server
-p [port]   port to listen on
""")
            sys.exit(0)
    serverMain()