python - Can I derive from a class that can only be created by a "factory"? -

suppose library i'm using implements class

class base(object):     def __init__(self, private_api_args):         ... 

it's meant instantiated via

def factory(public_api_args):     """     returns base object     """     ... 

i'd extend base class adding couple of methods it:

class derived(base):     def foo(self):         ...     def bar(self):         ... 

is possible initialize derived without calling private api though?

in other words, should replacement factory function?

if not have access private api, can following thing:

class base(object):     def __init__(self, private_api_args):         ...   def factory(public_api_args):     """ returns base object """     # create base object private api methods     return base_object   class derived(object):     def __init__(self, public_api_args):         # indirect access private api method of base object class         self.base_object = factory(public_api_args)      def foo(self):         ...     def bar(self):         ... 

and in main script:

#!/usr/bin/python3  # create derivate object public api args derived_object = derived(public_api_args)  # call private api methods derived_object.base_object.method()  # call method same object derived_object.foo() derived_object.bar()