Showcase of dataclasses and module __getattr__().

dice.py

#!/usr/bin/env python3
# -*- coding: UTF-8 -*-

from dataclasses import dataclass
from random import randint
import re

dn = re.compile(r'd([123456789][0123456789]*)')

__all__ = ['Die']

@dataclass(frozen=True)
class Die:
    sides: int

    def roll(self):
        return randint(1, self.sides)

def __getattr__(name):
    match = dn.match(name)
    if match is not None:
        sides = int(match.group(1))
        return Die(sides)
    raise AttributeError(f"module {__name__} has no attribute {name}")