parameters: (self, axis=None, inplace=False, limit=None, downcast=None)
return_statement: return self.fillna(method='ffill', axis=axis, inplace=inplace,
                             limit=limit, downcast=downcast)
docstring: Synonym for :meth:`DataFrame.fillna` with ``method='ffill'``.
docstring_summary: Synonym for :meth:`DataFrame.fillna` with ``method='ffill'``.
docstring_tokens: Synonym for : meth : DataFrame . fillna with method = ffill .
function: def ffill(self, axis=None, inplace=False, limit=None, downcast=None):
          """
          Synonym for :meth:`DataFrame.fillna` with ``method='ffill'``.
          """
          return self.fillna(method='ffill', axis=axis, inplace=inplace,
                             limit=limit, downcast=downcast)
function_tokens: def ffill ( self , axis = None , inplace = False , limit = None , downcast = None ) : return self . fillna ( method = 'ffill' , axis = axis , inplace = inplace , limit = limit , downcast = downcast )