Not 100% sure why print d gives None but if you need to print something that represents the instance, use repr
>>> d.__str__ <method-wrapper object at 0x0098C450> >>> str(d) 'None' >>> repr(d) '<asyncore.dispatcher at 0x8d5be8>' >>> print repr(d) <asyncore.dispatcher at 0x8d5be8> Why isn't __str__ in dir? >>> dir(d) ['__doc__', '__getattr__', '__init__', '__module__', '__repr__', '_map', 'accept ', 'accepting', 'add_channel', 'addr', 'bind', 'close', 'closing', 'connect', 'c onnected', 'create_socket', 'debug', 'del_channel', 'handle_accept', 'handle_clo se', 'handle_connect', 'handle_error', 'handle_expt', 'handle_expt_event', 'hand le_read', 'handle_read_event', 'handle_write', 'handle_write_event', 'listen', ' log', 'log_info', 'readable', 'recv', 'send', 'set_reuse_addr', 'set_socket', 's ocket', 'writable'] -- http://mail.python.org/mailman/listinfo/python-list
