code: def _del_attrib(element):
          '''_del_attrib
  
          Low-level api: Delete four attributes from an Element node if they
          exist: operation, insert, value and key.
  
          Parameters
          ----------
  
          element : `Element`
              The Element node needs to be looked at.
  
          Returns
          -------
  
          Element
              The Element node is returned after processing.
          '''
  
          for tag in operation_tag, insert_tag, value_tag, key_tag:
              if element.get(tag):
                  del element.attrib[tag]
          return elemenf _del_attrib(element):
          '''_del_attrib
  
          Low-level api: Delete four attributes from an Element node if they
          exist: operation, insert, value and key.
  
          Parameters
          ----------
  
          element : `Element`
              The Element node needs to be looked at.
  
          Returns
          -------
  
          Element
              The Element node is returned after processing.
          '''
  
          for tag in operation_tag, insert_tag, value_tag, key_tag:
              if element.get(tag):
                  del element.attrib[tag]
          return element
docs: _del_attrib
  
          Low-level api: Delete four attributes from an Element node if they
          exist: operation, insert, value and key.
  
          Parameters
          ----------
  
          element : `Element`
              The Element node needs to be looked at.
  
          Returns
          -------
  
          Element
              The Element node is returned after processing.