def test_view_setattr_machinery(attr, subset_func, subset_func2):
    # Tests that setting attributes on a view doesn't mess anything up too bad
    adata = gen_adata((10, 10))
    view = adata[subset_func(adata.obs_names), subset_func2(adata.var_names)]

    actual = view.copy()
    setattr(view, attr, getattr(actual, attr))
    assert_equal(actual, view, exact=True)
def exiter_as_until_exception(
        cls, new_exiter_fun: Callable[[Optional[Exiter]], Exiter]
    ) -> Iterator[None]:
        """Temporarily override the global exiter, except this will unset it when an exception
        happens."""
        previous_exiter = cls._exiter
        new_exiter = new_exiter_fun(previous_exiter)
        try:
            cls._reset_exiter(new_exiter)
            yield
        finally:
            cls._reset_exiter(previous_exiter)