code: def dashes_to_unders_in_keys(self) -> None:
          
          for key_node, _ in self.yaml_node.value:
              key_node.value = key_node.value.replace('-', '_')
docs: Replaces dashes with underscores in key names.
  
          For each attribute in a mapping, this replaces any dashes in \
          its keys with underscores. Handy because Python does not \
          accept dashes in identifiers, while some YAML-based file \
          formats use dashes in their keys.