def call_me(iocb):
    """
    When a controller completes the processing of a request, 
    the IOCB can contain one or more functions to be called. 
    """
    if _debug: call_me._debug("callback_function %r", iocb)

    # it will be successful or have an error
    print("call me, %r or %r" % (iocb.ioResponse, iocb.ioError))
When a controller completes the processing of a request, 
    the IOCB can contain one or more functions to be called.