code: def uid_something_colon(self, node):
          
          node.op_pos = [
              NodeWithPosition(node.uid, (node.first_line, node.first_col))
          ]
          position = (node.body[0].first_line, node.body[0].first_col)
          last, first = self.operators[':'].find_previous(position)
          node.op_pos.append(NodeWithPosition(last, first))
          return last
docs: Creates op_pos for node from uid to colon