parameters: (self)
return_statement: return w
docstring: Internal function.
docstring_summary: Internal function.
docstring_tokens: Internal function .
function: def _root(self):
          """Internal function."""
          w = self
          while w.master: w = w.master
          return w
function_tokens: def _root ( self ) : w = self while w . master : w = w . master return w