python ABCMeta example

abcmetaexample.py

from abc import ABCMeta, abstractmethod

class SomeClass:

    def __init__(self):
        pass

    def another_request(self):
        print('test')


class ITarget(metaclass = ABCMeta):
    """
    Define the domain-specific interface that Client uses.
    https://docs.python.org/3/library/abc.html#abc.abstractmethod
    The abstractmethod() only affects subclasses derived using regular
    inheritance; “virtual subclasses” registered with the ABC’s register()
    method are not affected.
    """

    @abstractmethod
    def request(self):
        pass

    @abstractmethod
    def whatever(self):
        pass


class Adaptee:
    """
    Define an existing interface that needs adapting.
    """

    def specific_request(self):
        print('This is the output')
        pass


class Adapter(ITarget, SomeClass):
    """
    Adapt the interface of Adaptee to the ITarget interface by implementing the target interface
    """
    def __init__(self, adaptee):
        self._adaptee = adaptee

    def request(self):
        self._adaptee.specific_request()

    def whatever(self):
        pass



def main():
    adaptee = Adaptee()
    adapter = Adapter(adaptee)
    adapter.request()
    adapter.another_request()
    adapter.whatever()
    

if __name__ == "__main__":
    main()