def del_node(self, node):
if self.has_node(node):<EOL><INDENT>for e in self.node_links[node]:<EOL><INDENT>self.edge_links[e].remove(node)<EOL><DEDENT>self.node_links.pop(node)<EOL>self.graph.del_node((node,'<STR_LIT:n>'))<EOL><DEDENT>
Delete a given node from the hypergraph.

@type  node: node
@param node: Node identifier.