Method __init_subclass__

example_code/item_065.py:144–149

(cls)

print("Example 8")
class BetterRowMapper(RowMapper):
    def __init_subclass__(cls):
        fields = []
        for key, value in cls.__dict__.items():
            if value is Ellipsis:
                fields.append(key)
        cls.fields = tuple(fields)


print("Example 9")