A singleton "like" Python snippet using lru_cache

singleton.py

#!/usr/bin/env python3

from functools import lru_cache


class Singleton:
    @lru_cache
    def __new__(cls, *args, **kwargs):
        return super().__new__(cls)

    def __init__(self, *args, **kwargs):
        pass


if __name__ == "__main__":
    s1 = Singleton(foo="bar")
    s2 = Singleton(foo="bar")

    assert s1 is s2

    # A single instance of the class is returned as long as the class is
    # instantiated with the same arguments.
    print(f"{id(s1)} is {id(s2)}")

    # But, if different arguments are passed a new instance is created.
    s3 = Singleton(baz="bam")

    assert s1 is not s3

    print(f"{id(s1)} is not {id(s3)}")