"""Python 3.8 兼容：提供 asyncio.to_thread 的等价实现。"""
from __future__ import annotations

import asyncio
import functools
from typing import Any, Callable, TypeVar

T = TypeVar("T")


async def to_thread(func: Callable[..., T], *args: Any, **kwargs: Any) -> T:
    """asyncio.to_thread 的 Python 3.8 兼容版本。"""
    loop = asyncio.get_running_loop()
    return await loop.run_in_executor(None, functools.partial(func, *args, **kwargs))