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(cls, new_exiter_fun: Callable[[Optional[Exiter]], Exiter]) -> Iterator[None]:
        """Temporarily override the global exiter.

        NB: We don't want to try/finally here, because we want exceptions to propagate
        with the most recent exiter installed in sys.excepthook.
        If we wrap this in a try:finally, exceptions will be caught and exiters unset.
        """
        previous_exiter = cls._exiter
        new_exiter = new_exiter_fun(previous_exiter)
        cls._reset_exiter(new_exiter)
        yield
        cls._reset_exiter(previous_exiter)