MRO iteration solution

nicks.py

from abc import ABCMeta


class Renderer(metaclass=ABCMeta):
    def __init__(self, entity):
        self._entity = entity
        self._render_entity = self._locate_renderer()
    
    def _locate_renderer(self):
        for cls in self.__class__.mro():
            if not hasattr(cls, '_type'):
                raise TypeError('Cannot render {!r}'.format(self._entity))
            
            if isinstance(self._entity, cls._type):
                return cls._render
    
    def __call__(self):
        return self._render_entity(self)


class IntRenderer(Renderer):
    _type = int
    
    def _render(self):
        return 'INTEGER {}'.format(self._entity)


class FloatRenderer(Renderer):
    _type = float
    
    def _render(self):
        return 'FLOAT {}'.format(self._entity)


class CompositeRenderer(
    IntRenderer,
    FloatRenderer,
):
    pass


if __name__ == '__main__':
    numbers = [10, 4.1, 91.1, 1000]
    for number in numbers:
        renderer = CompositeRenderer(number)
        print(renderer())

    '''
    OUTPUT:
    
    INTEGER 10
    FLOAT 4.1
    FLOAT 91.1
    INTEGER 1000
    '''