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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_path_list(self, type_str=None):
 """Get list of the labels of the nodes leading up to this node from the root. Args: type_str: SUBJECT_NODE_TAG, TYPE_NODE_TAG or None. If set, only include information from nodes of that type. Returns: list of str: The labels of the nodes leading up to this node from the root. """

        return list(
            reversed(
                [v.label_str for v in self.parent_gen if type_str in (None, v.type_str)]
            )
        )