def load_external_class(python_file, base_class):
    """
    Returns a tuple: (subclass of base_class, module)
    """
    loaded_module = load_external_module(python_file)

    # Find a class that extends base_class
    loaded_class = extract_class(loaded_module, base_class)
    return loaded_class, loaded_module
Returns a tuple: (subclass of base_class, module)