def test_views():
    X = np.array(X_list)
    adata = ad.AnnData(X, obs=obs_dict, var=var_dict, uns=uns_dict, dtype="int32")

    assert adata[:, 0].is_view
    assert adata[:, 0].X.tolist() == np.reshape([1, 4, 7], (3, 1)).tolist()

    adata[:2, 0].X = [0, 0]

    assert adata[:, 0].X.tolist() == np.reshape([0, 0, 7], (3, 1)).tolist()

    adata_subset = adata[:2, [0, 1]]

    assert adata_subset.is_view
    # now transition to actual object
    adata_subset.obs["foo"] = range(2)
    assert not adata_subset.is_view

    assert adata_subset.obs["foo"].tolist() == list(range(2))
def set_deadline(cls, course_key, deadline, is_explicit=False):
        """
        Configure the verification deadline for a course.

        If `deadline` is `None`, then the course will have no verification
        deadline.  In this case, users will be able to verify for the course
        at any time.

        Arguments:
            course_key (CourseKey): Identifier for the course.
            deadline (datetime or None): The verification deadline.

        """
        if deadline is None:
            VerificationDeadline.objects.filter(course_key=course_key).delete()
        else:
            record, created = VerificationDeadline.objects.get_or_create(
                course_key=course_key,
                defaults={"deadline": deadline, "deadline_is_explicit": is_explicit}
            )

            if not created:
                record.deadline = deadline
                record.deadline_is_explicit = is_explicit
                record.save()