parameters: (self)
docstring: Return a cloned (deep) copy of self.
  
          This must be implemented by the concrete subclass.
docstring_summary: Return a cloned (deep) copy of self.
docstring_tokens: Return a cloned ( deep ) copy of self .
function: def clone(self):
          """
          Return a cloned (deep) copy of self.
  
          This must be implemented by the concrete subclass.
          """
          raise NotImplementedError
function_tokens: def clone ( self ) : raise NotImplementedError