dynamic class creation in python -

i want create class dynamically:

class createagent(show.showone):     """create compute agent command"""      log = logging.getlogger(__name__ + ".createagent")      def get_parser(self, prog_name):         parser = super(createagent, self).get_parser(prog_name)         parser.add_argument(             "os",             metavar="<os>",             help="type of os")         parser.add_argument(             "architecture",             metavar="<architecture>",             help="type of architecture")         parser.add_argument(             "version",             metavar="<version>",             help="version")         parser.add_argument(             "url",             metavar="<url>",             help="url")         parser.add_argument(             "md5hash",             metavar="<md5hash>",             help="md5 hash")         parser.add_argument(             "hypervisor",             metavar="<hypervisor>",             help="type of hypervisor",             default="xen")         return parser      def take_action(self, parsed_args):         self.log.debug("take_action(%s)", parsed_args)         compute_client = self.app.client_manager.compute         args = (             parsed_args.os,             parsed_args.architecture,             parsed_args.version,             parsed_args.url,             parsed_args.md5hash,             parsed_args.hypervisor         )         agent = compute_client.agents.create(*args)._info.copy()         return zip(*sorted(six.iteritems(agent))) 

i went through many links find resources dynamic class creation of classes basic variables declarations , function.

class foo(object):     x = 10     y = 20     def get_x(self):         return self.x     def get_y(self):         return self.y 

dynamic class creation can done as:

bar = type(        'bar',        (object,),        dict(             x = 10,             y = 20,             get_x=lambda self:self.x,             get_y=lambda self:self.y         )         ) 

but don't know how crete createaent class , define functions dynamically..

this code have written:

def create_model(name, base=none, fields=none):     model = type(name, base, fields)      return model  if __name__ == '__main__':     fields = {         'os': str,         'architecture': str,         'version': int,         'url': str,         'md5hash': int,         'hypervisor': int,         }     model = create_model('createagent', ('showone',), fields)     model.os = "windows"     print model.os 

1. it gives me following error:

   typeerror: metaclass conflict: metaclass of derived class must (non-strict) subclass of metaclasses of bases

2. i don't know how define get_parser function.

ps: hints helpful

in type() command have (object,), want have

(show.showone, object), 

and have dict(...) existing dictionary:

def some_func(self):     do_something()  cls_dict['some_func'] = some_func 

and bar creation like:

# towards top of file import show  # somewhere else in file... bar = type(         'bar',         (show.showone, object),         cls_dict,         )