def test_drop_obs_column():
    adata = ad.AnnData(np.array(X_list), obs=obs_dict, dtype="int32")

    subset = adata[:2]
    assert subset.is_view
    # returns a copy of obs
    assert subset.obs.drop(columns=["oanno1"]).columns.tolist() == ["oanno2", "oanno3"]
    assert subset.is_view
    # would modify obs, so it should actualize subset and not modify adata
    subset.obs.drop(columns=["oanno1"], inplace=True)
    assert not subset.is_view
    assert subset.obs.columns.tolist() == ["oanno2", "oanno3"]

    assert adata.obs.columns.tolist() == ["oanno1", "oanno2", "oanno3"]
def unbound_on_Connection(server, user,
                                  password,
                                  auto_bind,
                                  client_strategy,
                                  authentication,
                                  check_names,
                                  auto_referrals, *a, **kwargs):
            return self._on_Connection(server, user,
                                       password,
                                       auto_bind,
                                       client_strategy,
                                       authentication,
                                       check_names,
                                       auto_referrals, *a,
                                       **kwargs)