Useful BaseContainer and BaseContainerElement classes

container.py

from inspect import getmembers

class BaseContainerElement(object):
    """
    BaseContainerElement is a generic element for a container

    Process is where the magic should take place.
    """
    def process(self, **kwargs):
        pass

class BaseContainer(object):
    """
    BaseContainer is a generic elements container.

    :params

    element_class -- The class for a container element.

    element_sequence -- Either the explicit list of elements of
        container elements to use by key, or all of the elements
        in the class.
    """
    element_class = BaseContainerElement
    element_sequence = None

    def __init__(self):
        if not self.element_sequence:
            self.element_sequence = []
            for key, value in getmembers(self):
                if isinstance(value, self.element_class):
                    self.element_sequence.append(key)
    
    def get_element(self, key):
        return getattr(self, key) if key in self.element_sequence else None

    def get_result(self, key, process_kwargs=None):
        if not process_kwargs: process_kwargs = {}
        return self.get_element(key).process(**process_kwargs)