def METHOD_NAME(cls, file_type, load_callable):
    """Register a load function for a specific file type.
    Args:
        file_type(str): File extension to be registered, e.g. '.txt', '.csv'
        load_callable(callable): function excepting a file or file-handle, returning an appropriate object for
            this file type.
    """
    cls._file_types[file_type] = load_callable