Given a modular path to a function, import that module
        and return the function.

def import_module_and_get_function(whole_function):
        """
        Given a modular path to a function, import that module
        and return the function.
        """
        module, function = whole_function.rsplit('.', 1)
        app_module = importlib.import_module(module)
        app_function = getattr(app_module, function)
        return app_function