code: def find_item(self, fq_name):
          
          names = fq_name.split(self._separator)
          current = self._yapconf_items
          for name in names:
              if isinstance(current, (YapconfDictItem, YapconfListItem)):
                  current = current.children
  
              if name not in current:
                  return None
              current = current[name]
          return current
docs: Find an item in the specification by fully qualified name.
  
          Args:
              fq_name (str): Fully-qualified name of the item.
  
          Returns:
              The item if it is in the specification. None otherwise