Abstract in python

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Use the abc module to create abstract classes. Use the abstractmethod decorator to declare a method abstract, and declare a class abstract using one of three ways, depending upon your Python version. # Python 3.4+ from abc import ABC, abstractmethod class Abstract(ABC): @abstractmethod def foo(self): pass  In Python 3.4 and above, you can inherit from ABC.In earlier versions of Python, you need to specify your class's metaclass as ABCMeta. Specifying the metaclass has different syntax in Python 3 and Python 2. The three possibilities are shown below: # Python 2 from abc import ABCMeta, abstractmethod class Abstract: __metaclass__ = ABCMeta @abstractmethod def foo(self): pass