def main()

in fix-client.py [0:0]
60 lines of code
24 McCabe index (conditional complexity)

def main(config_file):
    try:
        config = configparser.ConfigParser()
        config.read(config_file)
        sender_pwd = config["SESSION"]["SenderPassword"] if "SESSION" in config and "SenderPassword" in config["SESSION"] else None
        if not sender_pwd:
            print("Warning: SESSION SenderPassword is not specified in config file: " + config_file)

        settings = fix.SessionSettings(config_file)
        application = Application()
        application.setSessionPassword(sender_pwd)
        store_factory = fix.FileStoreFactory(settings)
        log_factory = fix.FileLogFactory(settings)
        initiator = fix.SocketInitiator(application, store_factory, settings, log_factory)
        initiator.start()

        parser = argparse.ArgumentParser(description='CLI Command', prog="command", usage="help | exit | {buy,sell} -s SYMBOL -q QUANTITY [-t {LIMIT,MARKET}] [-p PRICE] [-d DESTINATION] [-e EXCHANGE] [-n ORDER_COUNT] [-i INTERVAL]")
        parser.add_argument("command", type=str, choices=["buy", "sell"], help="Command")
        parser.add_argument("-s", "--symbol", type=str, required=True, help="Order instrument symbol")
        parser.add_argument("-q", "--quantity", type=float, required=True, help="Order quantity")
        parser.add_argument("-t", "--order_type", type=str, choices=["LIMIT", "MARKET"], default="MARKET", help="Order type")
        parser.add_argument("-p", "--price", type=float, default=None, help="Order limit price")
        parser.add_argument("-d", "--destination", type=str, default="SIM", help="Destination ID")
        parser.add_argument("-e", "--exchange", type=str, default=None, help="Exchange ID")
        parser.add_argument("-n", "--order_count", type=int,  default=1, help="Number of orders to submit")
        parser.add_argument("-i", "--interval", type=int, default=5, help="Number of seconds between orders")

        # wait for the client to login
        while not application.sessionID and not application.logged_out:
            time.sleep(0.5)

        if not application.sessionID:
            print("Login failed")
            exit(1)

        while 1:
            print("--> ", end='')
            command = input().strip()
            if not command:
                continue

            command_args = command.split(' ') if ' ' in command else [ command ]
            command = command_args[0]

            if command == "buy" or command == "sell":
                try :
                    args = parser.parse_args(command_args)

                    side = fix.Side_BUY if command == "buy" else fix.Side_SELL
                    order_type = fix.OrdType_LIMIT if args.order_type == "LIMIT" else fix.OrdType_MARKET

                    if order_type == fix.OrdType_LIMIT and args.price is None:
                        print("Please specify LIMIT order price")
                        continue

                    for x in range(args.order_count):
                        if x > 0:
                            time.sleep(args.interval)
                        application.submit_order(args.symbol, side, order_type, args.quantity, args.price, args.destination, args.exchange)

                    time.sleep(0.5) # wait a bit for response
                except:
                    print(sys.exc_info()[1])
            elif command == "quit" or command == "exit":
                sys.exit(0)
            elif command == "help":
                parser.print_usage()
            else:
                print("Unknown command: %s" % command)
                parser.print_usage()

    except (fix.ConfigError, fix.RuntimeError) as e:
        print(e)