import attr

from clime import clime


def x_smaller_than_100(instance, attribute, value):
    if not value < 100:
        raise ValueError(f"{attribute.name} has to be smaller than 100!")


@attr.s
class Dude:
    favorite_number_less_than_100: int = attr.ib(
        validator=[attr.validators.instance_of(int), x_smaller_than_100]
    )

    def print_favorite_number_less_than_100(self):
        print(
            f"My favorite number less than 100 is {self.favorite_number_less_than_100}"
        )


def main():
    clime(Dude).print_favorite_number_less_than_100()


if __name__ == "__main__":
    main()

$ python docs_src\supercharge_with_attrib\tutorial_002.py  10
My favorite number less than 100 is 10

$ python docs_src\supercharge_with_attrib\tutorial_002.py  101
Traceback (most recent call last):
  File "C:\Users\ilanb\PycharmProjects\attrsargparser\docs_src\supercharge_with_attrib\tutorial_002.py", line 24, in <module>
    main()
  File "C:\Users\ilanb\PycharmProjects\attrsargparser\docs_src\supercharge_with_attrib\tutorial_002.py", line 20, in main
    clime(Dude).print_favorite_number_less_than_100()
  File "C:\Users\ilanb\PycharmProjects\attrsargparser\clime\clime.py", line 100, in clime
    return attrs_decorated_class(**args.__dict__)
  File "<attrs generated init __main__.Dude>", line 4, in __init__
  File "C:\Users\ilanb\PycharmProjects\attrsargparser\venv\lib\site-packages\attr\_make.py", line 2975, in __call__
    v(inst, attr, value)
  File "C:\Users\ilanb\PycharmProjects\attrsargparser\docs_src\supercharge_with_attrib\tutorial_002.py", line 9, in x_smaller_than_100
    raise ValueError(f"{attribute.name} has to be smaller than 100!")
ValueError: favorite_number_less_than_100 has to be smaller than 100!