cond デコレータ

cond.py

from dataclasses import dataclass

class Cond:
    def __init__(self):
        self.conditions = []

    def add(self, predicate, func):
        self.conditions.append((predicate, func))

    def call(self, *args, **kwargs):
        try:
            func = next(f
                for p, f
                in self.conditions 
                if p(*args, **kwargs)
            )
            return func(*args, **kwargs)
        except StopIteration:
            raise RuntimeError("No condition match")

    def cond(self, predicate=lambda _: True):
        def _predicate(func):
            self.add(predicate, func)
        return _predicate

classifier = Cond()
@classifier.cond(lambda file: file.i <= 5 and file.like >= 5)
def ranked(file) -> str:
    return "Ranked.{today('yyyy-MM-dd')}"

@classifier.cond(lambda file: file.like >= 5)
def revenging(file) -> str:
    return "2.Revenging"

@classifier.cond()
def unranked(file) -> str:
    return "Unranked"

@dataclass
class File:
    i: int
    like: int

f = File(6, 5)
print(classifier.call(f))