parameters: (self)
return_statement: return len(self.treeList)
docstring: allows len(forest) to work
docstring_summary: allows len(forest) to work
docstring_tokens: allows len ( forest ) to work
function: def __len__(self):
      """ allows len(forest) to work
  
      """
      return len(self.treeList)
function_tokens: def __len__ ( self ) : return len ( self . treeList )