code: def get_3_tuple_list(self,obj,default=None):
          
          if is_sequence2(obj):
              return [self.get_3_tuple(o,default) for o in obj]
          elif is_sequence(obj):
              return [self.get_3_tuple(obj[i:i+3],default) for i in range(0,len(obj),3)]
          else:
              return [self.get_3_tuple(obj,default)]
docs: Return list of 3-tuples from
          sequence of a sequence,
          sequence - it is mapped to sequence of 3-sequences if possible
          number