docs: def get_key_value_dict_by_selectors(
          self, key_selector, value_selector, value_sub_selector=None
      ):
          """Return a dictionary of key value data."""
          key_nodes = self.parsedpage.get_nodes_by_selector(key_selector)
          keys = [
              self.parsedpage.get_text_from_node(node)
              for node in key_nodes
          ]
  
          value_nodes = self.parsedpage.get_nodes_by_selector(value_selector)
          if value_sub_selector is not None:
              vals = [
                  [
                      self.parsedpage.get_text_from_node(subnode)
                      for subnode in node.find(value_sub_selector)
                  ]
                  for node in value_nodes.items()
              ]
          else:
              vals = [
                  self.parsedpage.get_text_from_node(node)
                  for node in value_nodes
              ]
  
          return dict(zip(keys, vals))