code: def where(self, where: str) -> 'SASdata':
          
          sd = SASdata(self.sas, self.libref, self.table, dsopts=dict(self.dsopts))
          sd.HTML = self.HTML
          sd.dsopts['where'] = where
          return sd
docs: This method returns a clone of the SASdata object, with the where attribute set. The original SASdata object is not affected.
  
          :param where: the where clause to apply
          :return: SAS data object