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class A(object): def a(self): raise NotImplementedError class B(A): def a(self): return 7 class C(B): pass Why does Pycharm complain?
Problem synopsis Class C must implement all abstract methods
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Yes, you have to implement all abstract methods in Python to instantiate them as objects (the ones marked with @abstractmethod , etc). How you implement these, however, are completely up to you. If you're not going to be instantiating, you don't need to override all of them.
It's not necessary for an abstract class to have abstract method. We can mark a class as abstract even if it doesn't declare any abstract methods. If abstract class doesn't have any method implementation, its better to use interface because java doesn't support multiple class inheritance.
An abstract method is a method that is declared, but contains no implementation. Abstract classes may not be instantiated, and its abstract methods must be implemented by its subclasses.
It's a reported bug - you can vote for it here: https://youtrack.jetbrains.com/issue/PY-16132
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