from contextlib import contextmanager
import os
from typing import Union, Iterator
from pathlib import Path


class WithIter(type):
    def __iter__(cls):
        return (v for k, v in cls.__dict__.items() if not k.startswith("_"))


@contextmanager
def cd(path: Union[Path, str]) -> Iterator[None]:
    oldpwd = os.getcwd()
    os.chdir(path)
    try:
        yield
    finally:
        os.chdir(oldpwd)