Python: returning an instance of derived class from a base class method -

assume following situation. there base class holding data , derived class assumes data has additional characteristic allows running algorithm. base class has algorithm processes data in generic way , returns copy result of processing. now, processing not affect specific characteristic of data , therefore can safely assume returned value should of type of derived class.

my current implementation:

class genericdata:      def __init__(self, d):         self._d = d      def process(self):         # process data in way compatible         # specialization. then, return instance         # of specific derived class.         return type(self)(some_processing(self._d))   class specificdata(genericdata):      """this class gathering of algorithms make        assumptions d."""      def __init__(self, d):         super().__init__(d)      def algorithm():         # stuff assuming characteristic of data         pass 

my question is: good/pythonic way of handling such case? answer question either different design pattern or better implementation of pattern used above.