class ConversionMixin:
    converters = []

    def clean(self, raw_value):
        for converter in self.converters:
            raw_value = converter(raw_value)

        return super().clean(raw_value)


def with_converters(field, *converters, **field_kwargs):
    class_name = 'Conversion{}'.format(field.__name__)
    new_class = type(class_name, (ConversionMixin, field), {'converters': converters})
    return partial(new_class, **field_kwargs)