parameters: (self)
return_statement: return self._parent
docstring: Returns the parent of the frame, or None if it's given in the world
          frame.
docstring_summary: Returns the parent of the frame, or None if it's given in the world
          frame.
docstring_tokens: Returns the parent of the frame or None if it s given in the world frame .
function: def parent(self):
          """Returns the parent of the frame, or None if it's given in the world
          frame."""
          return self._parent
function_tokens: def parent ( self ) : return self . _parent