def test_set_subset_varm(adata, subset_func):
    init_hash = joblib.hash(adata)
    orig_varm_val = adata.varm["o"].copy()

    while True:
        subset_idx = slice_subset(adata.var_names)
        if (adata[:, subset_idx]).shape[1] > 2:
            break
    subset = adata[:, subset_idx]

    internal_idx = _normalize_index(
        subset_func(np.arange(subset.varm["o"].shape[0])), subset.var_names
    )

    assert subset.is_view
    subset.varm["o"][internal_idx] = 1
    assert not subset.is_view
    assert np.all(adata.varm["o"] == orig_varm_val)

    assert init_hash == joblib.hash(adata)
def install_secret_key(app, filename='secret_key'):
    """Configure the SECRET_KEY from a file
    in the instance directory.

    If the file does not exist, print instructions
    to create it from a shell with a random key,
    then exit.
    """
    filename = os.path.join(app.instance_path, filename)

    try:
        app.config['SECRET_KEY'] = open(filename, 'rb').read()
    except IOError:
        print('Error: No secret key. Create it with:')
        full_path = os.path.dirname(filename)
        if not os.path.isdir(full_path):
            print('mkdir -p {filename}'.format(filename=full_path))
        print('head -c 24 /dev/urandom > {filename}'.format(filename=filename))
        sys.exit(1)