module以下にあってbase_classを継承しているクラスを列挙

list_classes.py

import inspect
import importlib


def list_classes(module, base_class):
    return _list_classes(module, base_class, set())


def _list_classes(module, base_class, result):
    for maybe_class in [member[1] for member in inspect.getmembers(module)]:
        if maybe_class is not None and inspect.isclass(maybe_class) and issubclass(maybe_class, base_class):
            result.add(maybe_class)

    for sig in module.__all__:
        mod_or_class = '.'.join([module.__name__, sig])

        try:
            mod = importlib.import_module(mod_or_class)
            result |= _list_classes(mod, base_class, result)
        except Exception as e:
            continue

    return result


if __name__ == '__main__':
    import sklearn
    from sklearn.base import ClassifierMixin
    print('\n'.join([str(c) for c in list_classes(sklearn, ClassifierMixin)]))