from abc import ABCMeta, abstractmethod, abstractproperty

class IRobot(metaclass = ABCMeta):    
    @abstractproperty
    def data(self):
        pass
    
    @abstractmethod
    def speak(self):
        pass

class Chitti(IRobot):
    def __init__(self, value):    # Dunder - Double Underscore
        self._data = value
       
    @property    # Getter
    def data(self):
        return self._data
    
    def speak(self):
        print(f'{self.data}')

chitti = Chitti('Speed 1 Tera Hertz, Memory 1 Zetabyte!')

class NS5(IRobot):
    pass