def test_set_varm_key(adata):
    init_hash = joblib.hash(adata)

    orig_varm_val = adata.varm["o"].copy()
    subset_varm = adata[:, :50]
    assert subset_varm.is_view
    subset_varm.varm["o"] = np.ones((50, 20))
    assert not subset_varm.is_view
    assert np.all(adata.varm["o"] == orig_varm_val)

    assert init_hash == joblib.hash(adata)
def reset_interactive_output_stream(
        cls, interactive_output_stream, override_faulthandler_destination=True
    ):
        """Class state:

        - Overwrites `cls._interactive_output_stream`.
        OS state:
        - Overwrites the SIGUSR2 handler.

        This method registers a SIGUSR2 handler, which permits a non-fatal `kill -31 <pants pid>` for
        stacktrace retrieval. This is also where the the error message on fatal exit will be printed to.
        """
        try:
            # NB: mutate process-global state!
            # This permits a non-fatal `kill -31 <pants pid>` for stacktrace retrieval.
            if override_faulthandler_destination:
                faulthandler.register(
                    signal.SIGUSR2, interactive_output_stream, all_threads=True, chain=False
                )
            # NB: mutate the class variables!
            cls._interactive_output_stream = interactive_output_stream
        except ValueError:
            # Warn about "ValueError: IO on closed file" when the stream is closed.
            cls.log_exception(
                "Cannot reset interactive_output_stream -- stream (probably stderr) is closed"
            )