from typing import Literal

from sympy.core.core import Registry

class SingletonRegistry(Registry):
    __slots__ = ...
    __call__ = ...
    def __init__(self) -> None: ...
    def register(self, cls) -> None: ...
    def __getattr__(self, name): ...
    def __repr__(self) -> Literal["S"]: ...

S = ...

class Singleton(type):
    def __init__(cls, *args, **kwargs) -> None: ...