Python: Dynamically call function within abstract class -

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i have class instance needs call analyse method. constructor receives request object kind of message

{ "message":{ "attributes":{ "message_id":"2aj78h98-2112-4637-76h1-09ec727933bb", "topic":"mytopic", "version":1 }, "data":"{"id": 123541234}" } }

my_model = mymodel(request) my_model.analyse(data)

the structure of class mymodel is:

import importlib   class mymodel(object):      def __init__(self, req):          """         request, extract topic , dynamically create    instance         """         try:             self.req = req             classname = self.req.topic # in example: mytopic             classpath = 'foo.bar'             module = importlib.import_module(classpath)             self.some_object = getattr(module, classname)         except exception e:             raise exception(e.message)      def analyse(self):         data = self.req.data         # self.some_object instance of foo.bar.mytopic         self.some_object.analyse(data)

here structure of mytopic class:

class mytopic(topicbase):      def __init__(self):         super(mytopic, self).__init__()         self.retreive_mode = 'api'      def _retreive_from_db(self):         print 'in db'      def _retreive_from_datawarehouse(self):         print 'in datawarehouse'      def _retreive_from_api(self):        print 'in api

and parent class:

from abc import abcmeta, abstractmethod  class topicbase(object): __metaclass__ = abcmeta      def __init__(self, *args, **kwargs):         pass      def analyse(self, data):         """         base on class configuration, call proper retreive method         """          def func_not_found():  # in case dont have method             raise notimplementederror          func_name = '_retreive_from_' + self.retreive_mode         func = getattr(self, func_name, func_not_found)         func(data)      @abstractmethod     def _retreive_from_db(self):         pass      @abstractmethod     def _retreive_from_datawarehouse(self):         pass      @abstractmethod     def _retreive_from_api(self):         pass

when my_model.analyse(data) called, error:

typeerror: unbound method analyse() must called mytopic instance first argument (got dict instance instead)

my_model instance of mytopic. if try my_model.analyse(my_model, data), got error:

typeerror: unbound method analyse() must called mytopic instance first argument (got abcmeta instance instead)

any idea??

this

self.some_object = getattr(module, classname)

sets self.some_object class (not instance of class), means when mymodel.analyse() calls

self.some_object.analyse(data)

it's calling someclass.analyse(data) , not someclass().analyse(data).


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