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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 _getnode(self, curie):
 # convention is lowercase names """ This is a wrapper for creating a URIRef or Bnode object with a given a curie or iri as a string. If an id starts with an underscore, it assigns it to a BNode, otherwise it creates it with a standard URIRef. Alternatively, self.skolemize_blank_node is True, it will skolemize the blank node :param curie: str identifier formatted as curie or iri :return: node: RDFLib URIRef or BNode object """

        node = None
        if curie[0] == '_':
            if self.are_bnodes_skized is True:
                node = self.skolemizeBlankNode(curie)
            else:  # delete the leading underscore to make it cleaner
                node = BNode(re.sub(r'^_:|^_', '', curie, 1))

        # Check if curie string is actually an IRI
        elif curie[:4] == 'http' or curie[:3] == 'ftp':
            node = URIRef(curie)
        else:
            iri = RDFGraph.curie_util.get_uri(curie)
            if iri is not None:
                node = URIRef(RDFGraph.curie_util.get_uri(curie))
                # Bind prefix map to graph
                prefix = curie.split(':')[0]
                if prefix not in self.namespace_manager.namespaces():
                    mapped_iri = self.curie_map[prefix]
                    self.bind(prefix, Namespace(mapped_iri))
            else:
                LOG.error("couldn't make URI for %s", curie)
        return node