mypy error: Value of type variable "_AnyPath" of "copyfile" cannot be "Union[str, Path]"

Question

这曾用于旧版本（0.6xx？）的 mypy：

import pathlib
import shutil
from typing import Union

def f(x: Union[str, pathlib.Path]):
    shutil.copyfile("bla", x)

但在它抱怨的 mypy 0.710 中没有：

error: Value of type variable "_AnyPath" of "copyfile" cannot be "Union[str, Path]"

应该如何修复？

Answer 1

这似乎是唯一的方法：

import os
import shutil
from typing import TypeVar

_AnyPath = TypeVar("_AnyPath", str, os.PathLike)

def f(x: _AnyPath):
    shutil.copyfile("bla", x)

mypy error: Value of type variable "_AnyPath" of "copyfile" cannot be "Union[str, Path]"

mypy error: Value of type variable "_AnyPath" of "copyfile" cannot be "Union[str, Path]"

python

mypy