parameters: (self, ndigits=None)
docstring: Rounds self to ndigits decimal places, defaulting to 0.
  
          If ndigits is omitted or None, returns an Integral, otherwise
          returns a Real. Rounds half toward even.
docstring_summary: Rounds self to ndigits decimal places, defaulting to 0.
docstring_tokens: Rounds self to ndigits decimal places defaulting to 0 .
function: def __round__(self, ndigits=None):
          """Rounds self to ndigits decimal places, defaulting to 0.
  
          If ndigits is omitted or None, returns an Integral, otherwise
          returns a Real. Rounds half toward even.
          """
          raise NotImplementedError
function_tokens: def __round__ ( self , ndigits = None ) : raise NotImplementedError