code: def to_frame(self, name=None):
          
          if name is None:
              df = self._constructor_expanddim(self)
          else:
              df = self._constructor_expanddim({name: self})
  
          return df
docs: Convert Series to DataFrame.
  
          Parameters
          ----------
          name : object, default None
              The passed name should substitute for the series name (if it has
              one).
  
          Returns
          -------
          DataFrame
              DataFrame representation of Series.
  
          Examples
          --------
          >>> s = pd.Series(["a", "b", "c"],
          ...               name="vals")
          >>> s.to_frame()
            vals
          0    a
          1    b
          2    c