What should I put in the body of an abstract method?

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The documentation does aim to give you an example. You don’t have to follow it.

You could provide a default; subclasses are still free to use super() to call your implementation. This is what most of the collections.abc classes do; see the source code.

Size for example, returns 0 for __len__:

class Sized(metaclass=ABCMeta):
    # ...
    @abstractmethod
    def __len__(self):
        return 0

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