Looks like a great change! I'm seeing some failing tests:

~/dev/scidata (DataView)$ python setup.py test running test running egg_info writing requirements to src/xray.egg-info/requires.txt writing src/xray.egg-info/PKG-INFO writing top-level names to src/xray.egg-info/top_level.txt writing dependency_links to src/xray.egg-info/dependency_links.txt reading manifest file 'src/xray.egg-info/SOURCES.txt' writing manifest file 'src/xray.egg-info/SOURCES.txt' running build_ext test_1d_math (test.test_array.TestArray) ... ok test_aggregate (test.test_array.TestArray) ... ERROR test_array_interface (test.test_array.TestArray) ... ok test_broadcasting_failures (test.test_array.TestArray) ... ok test_broadcasting_math (test.test_array.TestArray) ... ok test_collapse (test.test_array.TestArray) ... ok test_data (test.test_array.TestArray) ... ok test_from_stack (test.test_array.TestArray) ... ok test_groupby (test.test_array.TestArray) ... ERROR test_indexed_by (test.test_array.TestArray) ... ok test_inplace_math (test.test_array.TestArray) ... ok test_items (test.test_array.TestArray) ... ok test_properties (test.test_array.TestArray) ... ok test_repr (test.test_array.TestArray) ... ok test_transpose (test.test_array.TestArray) ... ok test_attributes (test.test_dataset.DataTest) ... SKIP: attribute checks are not yet backend specific test_coordinate (test.test_dataset.DataTest) ... ok test_copy (test.test_dataset.DataTest) ... ok test_dimension (test.test_dataset.DataTest) ... ok test_getitem (test.test_dataset.DataTest) ... ERROR test_indexed_by (test.test_dataset.DataTest) ... ok test_init (test.test_dataset.DataTest) ... ok test_iterator (test.test_dataset.DataTest) ... ok test_labeled_by (test.test_dataset.DataTest) ... ERROR test_merge (test.test_dataset.DataTest) ... ok test_rename (test.test_dataset.DataTest) ... ok test_repr (test.test_dataset.DataTest) ... ok test_select (test.test_dataset.DataTest) ... ok test_setitem (test.test_dataset.DataTest) ... ok test_to_dataframe (test.test_dataset.DataTest) ... ok test_unselect (test.test_dataset.DataTest) ... SKIP: need to write this test test_variable (test.test_dataset.DataTest) ... ok test_variable_indexing (test.test_dataset.DataTest) ... ok test_write_store (test.test_dataset.DataTest) ... ok test_attributes (test.test_dataset.NetCDF4DataTest) ... SKIP: attribute checks are not yet backend specific test_coordinate (test.test_dataset.NetCDF4DataTest) ... ok test_copy (test.test_dataset.NetCDF4DataTest) ... ok test_dimension (test.test_dataset.NetCDF4DataTest) ... ok test_dump_and_open_dataset (test.test_dataset.NetCDF4DataTest) ... ok test_getitem (test.test_dataset.NetCDF4DataTest) ... ERROR test_indexed_by (test.test_dataset.NetCDF4DataTest) ... ok test_init (test.test_dataset.NetCDF4DataTest) ... ok test_iterator (test.test_dataset.NetCDF4DataTest) ... ok test_labeled_by (test.test_dataset.NetCDF4DataTest) ... ERROR test_merge (test.test_dataset.NetCDF4DataTest) ... ok test_rename (test.test_dataset.NetCDF4DataTest) ... ok test_repr (test.test_dataset.NetCDF4DataTest) ... ok test_select (test.test_dataset.NetCDF4DataTest) ... ok test_setitem (test.test_dataset.NetCDF4DataTest) ... ok test_to_dataframe (test.test_dataset.NetCDF4DataTest) ... ok test_unselect (test.test_dataset.NetCDF4DataTest) ... SKIP: need to write this test test_variable (test.test_dataset.NetCDF4DataTest) ... ok test_variable_indexing (test.test_dataset.NetCDF4DataTest) ... ok test_write_store (test.test_dataset.NetCDF4DataTest) ... ok test_attributes (test.test_dataset.ScipyDataTest) ... SKIP: attribute checks are not yet backend specific test_coordinate (test.test_dataset.ScipyDataTest) ... ok test_copy (test.test_dataset.ScipyDataTest) ... ok test_dimension (test.test_dataset.ScipyDataTest) ... ok test_dump_and_open_dataset (test.test_dataset.ScipyDataTest) ... FAIL test_getitem (test.test_dataset.ScipyDataTest) ... ERROR test_indexed_by (test.test_dataset.ScipyDataTest) ... ok test_init (test.test_dataset.ScipyDataTest) ... ok test_iterator (test.test_dataset.ScipyDataTest) ... ok test_labeled_by (test.test_dataset.ScipyDataTest) ... ERROR test_merge (test.test_dataset.ScipyDataTest) ... ok test_rename (test.test_dataset.ScipyDataTest) ... ok test_repr (test.test_dataset.ScipyDataTest) ... ok test_select (test.test_dataset.ScipyDataTest) ... ok test_setitem (test.test_dataset.ScipyDataTest) ... ok test_to_dataframe (test.test_dataset.ScipyDataTest) ... ok test_unselect (test.test_dataset.ScipyDataTest) ... SKIP: need to write this test test_variable (test.test_dataset.ScipyDataTest) ... ok test_variable_indexing (test.test_dataset.ScipyDataTest) ... ok test_write_store (test.test_dataset.ScipyDataTest) ... ok test.test_dataset.create_test_data ... ok test_aggregate (test.test_dataset_array.TestDatasetArray) ... FAIL test_array_interface (test.test_dataset_array.TestDatasetArray) ... ok test_collapse (test.test_dataset_array.TestDatasetArray) ... ok test_dataset_getitem (test.test_dataset_array.TestDatasetArray) ... ok test_from_stack (test.test_dataset_array.TestDatasetArray) ... ok test_groupby (test.test_dataset_array.TestDatasetArray) ... FAIL test_indexed_by (test.test_dataset_array.TestDatasetArray) ... ok test_inplace_math (test.test_dataset_array.TestDatasetArray) ... ok test_intersection (test.test_dataset_array.TestDatasetArray) ... FAIL test_item_math (test.test_dataset_array.TestDatasetArray) ... ok test_items (test.test_dataset_array.TestDatasetArray) ... ok test_iteration (test.test_dataset_array.TestDatasetArray) ... ok test_labeled_by (test.test_dataset_array.TestDatasetArray) ... FAIL test_loc (test.test_dataset_array.TestDatasetArray) ... FAIL test_math (test.test_dataset_array.TestDatasetArray) ... ok test_properties (test.test_dataset_array.TestDatasetArray) ... ok test_refocus (test.test_dataset_array.TestDatasetArray) ... ok test_renamed (test.test_dataset_array.TestDatasetArray) ... ok test_frozen (test.test_utils.TestDictionaries) ... ok test_ordered_dict_intersection (test.test_utils.TestDictionaries) ... ok test_safe (test.test_utils.TestDictionaries) ... ok test_unsafe (test.test_utils.TestDictionaries) ... ok test_expanded_indexer (test.test_utils.TestIndexers) ... ok test_orthogonal_indexer (test.test_utils.TestIndexers) ... ok test (test.test_utils.TestNum2DatetimeIndex) ... ERROR

ERROR: test_aggregate (test.test_array.TestArray)

Traceback (most recent call last): File "/Users/ebrevdo/dev/scidata/test/test_array.py", line 240, in test_aggregate self.assertVarEqual(expected_unique, actual_unique) File "/Users/ebrevdo/dev/scidata/test/init.py", line 10, in assertVarEqual self.assertTrue(utils.variable_equal(v1, v2)) File "/Users/ebrevdo/dev/scidata/src/xray/utils.py", line 132, in variable_equal return np.array_equal(data1, data2) File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/numpy/core/numeric.py", line 1977, in array_equal return bool(logical_and.reduce(equal(a1,a2).ravel())) AttributeError: 'NotImplementedType' object has no attribute 'ravel'

ERROR: test_groupby (test.test_array.TestArray)

Traceback (most recent call last): File "/Users/ebrevdo/dev/scidata/test/test_array.py", line 220, in test_groupby self.assertVarEqual(expected_unique, grouped.unique_coord) File "/Users/ebrevdo/dev/scidata/test/init.py", line 10, in assertVarEqual self.assertTrue(utils.variable_equal(v1, v2)) File "/Users/ebrevdo/dev/scidata/src/xray/utils.py", line 132, in variable_equal return np.array_equal(data1, data2) File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/numpy/core/numeric.py", line 1977, in array_equal return bool(logical_and.reduce(equal(a1,a2).ravel())) AttributeError: 'NotImplementedType' object has no attribute 'ravel'

ERROR: test_getitem (test.test_dataset.DataTest)

Traceback (most recent call last): File "/Users/ebrevdo/dev/scidata/test/test_dataset.py", line 325, in test_getitem {'units': 'days since 2000-01-01'}) File "/Users/ebrevdo/dev/scidata/src/xray/dataset.py", line 464, in create_variable return self.add_variable(name, v) File "/Users/ebrevdo/dev/scidata/src/xray/dataset.py", line 534, in add_variable return self.set_variable(name, var) File "/Users/ebrevdo/dev/scidata/src/xray/dataset.py", line 595, in set_variable self.indices.build_index(name) File "/Users/ebrevdo/dev/scidata/src/xray/dataset.py", line 109, in build_index self.cache[key] = self.dataset._create_index(key) File "/Users/ebrevdo/dev/scidata/src/xray/dataset.py", line 224, in _create_index attr.get('calendar')) File "/Users/ebrevdo/dev/scidata/src/xray/utils.py", line 106, in num2datetimeindex dates = first_time_delta * num_delta + np.datetime64(first_dates[0]) TypeError: ufunc 'multiply' not supported for the input types, and the inputs could not be safely coerced to any supported types according to the casting rule 'safe'

ERROR: test_labeled_by (test.test_dataset.DataTest)

Traceback (most recent call last): File "/Users/ebrevdo/dev/scidata/test/test_dataset.py", line 234, in test_labeled_by {'units': 'days since 2000-01-01'}) File "/Users/ebrevdo/dev/scidata/src/xray/dataset.py", line 464, in create_variable return self.add_variable(name, v) File "/Users/ebrevdo/dev/scidata/src/xray/dataset.py", line 534, in add_variable return self.set_variable(name, var) File "/Users/ebrevdo/dev/scidata/src/xray/dataset.py", line 595, in set_variable self.indices.build_index(name) File "/Users/ebrevdo/dev/scidata/src/xray/dataset.py", line 109, in build_index self.cache[key] = self.dataset._create_index(key) File "/Users/ebrevdo/dev/scidata/src/xray/dataset.py", line 224, in _create_index attr.get('calendar')) File "/Users/ebrevdo/dev/scidata/src/xray/utils.py", line 106, in num2datetimeindex dates = first_time_delta * num_delta + np.datetime64(first_dates[0]) TypeError: ufunc 'multiply' not supported for the input types, and the inputs could not be safely coerced to any supported types according to the casting rule 'safe'

ERROR: test_getitem (test.test_dataset.NetCDF4DataTest)

Traceback (most recent call last): File "/Users/ebrevdo/dev/scidata/test/test_dataset.py", line 325, in test_getitem {'units': 'days since 2000-01-01'}) File "/Users/ebrevdo/dev/scidata/src/xray/dataset.py", line 464, in create_variable return self.add_variable(name, v) File "/Users/ebrevdo/dev/scidata/src/xray/dataset.py", line 534, in add_variable return self.set_variable(name, var) File "/Users/ebrevdo/dev/scidata/src/xray/dataset.py", line 595, in set_variable self.indices.build_index(name) File "/Users/ebrevdo/dev/scidata/src/xray/dataset.py", line 109, in build_index self.cache[key] = self.dataset._create_index(key) File "/Users/ebrevdo/dev/scidata/src/xray/dataset.py", line 224, in _create_index attr.get('calendar')) File "/Users/ebrevdo/dev/scidata/src/xray/utils.py", line 106, in num2datetimeindex dates = first_time_delta * num_delta + np.datetime64(first_dates[0]) TypeError: ufunc 'multiply' not supported for the input types, and the inputs could not be safely coerced to any supported types according to the casting rule 'safe'

ERROR: test_labeled_by (test.test_dataset.NetCDF4DataTest)

Traceback (most recent call last): File "/Users/ebrevdo/dev/scidata/test/test_dataset.py", line 234, in test_labeled_by {'units': 'days since 2000-01-01'}) File "/Users/ebrevdo/dev/scidata/src/xray/dataset.py", line 464, in create_variable return self.add_variable(name, v) File "/Users/ebrevdo/dev/scidata/src/xray/dataset.py", line 534, in add_variable return self.set_variable(name, var) File "/Users/ebrevdo/dev/scidata/src/xray/dataset.py", line 595, in set_variable self.indices.build_index(name) File "/Users/ebrevdo/dev/scidata/src/xray/dataset.py", line 109, in build_index self.cache[key] = self.dataset._create_index(key) File "/Users/ebrevdo/dev/scidata/src/xray/dataset.py", line 224, in _create_index attr.get('calendar')) File "/Users/ebrevdo/dev/scidata/src/xray/utils.py", line 106, in num2datetimeindex dates = first_time_delta * num_delta + np.datetime64(first_dates[0]) TypeError: ufunc 'multiply' not supported for the input types, and the inputs could not be safely coerced to any supported types according to the casting rule 'safe'

ERROR: test_getitem (test.test_dataset.ScipyDataTest)

Traceback (most recent call last): File "/Users/ebrevdo/dev/scidata/test/test_dataset.py", line 325, in test_getitem {'units': 'days since 2000-01-01'}) File "/Users/ebrevdo/dev/scidata/src/xray/dataset.py", line 464, in create_variable return self.add_variable(name, v) File "/Users/ebrevdo/dev/scidata/src/xray/dataset.py", line 534, in add_variable return self.set_variable(name, var) File "/Users/ebrevdo/dev/scidata/src/xray/dataset.py", line 595, in set_variable self.indices.build_index(name) File "/Users/ebrevdo/dev/scidata/src/xray/dataset.py", line 109, in build_index self.cache[key] = self.dataset._create_index(key) File "/Users/ebrevdo/dev/scidata/src/xray/dataset.py", line 224, in _create_index attr.get('calendar')) File "/Users/ebrevdo/dev/scidata/src/xray/utils.py", line 106, in num2datetimeindex dates = first_time_delta * num_delta + np.datetime64(first_dates[0]) TypeError: ufunc 'multiply' not supported for the input types, and the inputs could not be safely coerced to any supported types according to the casting rule 'safe'

ERROR: test_labeled_by (test.test_dataset.ScipyDataTest)

Traceback (most recent call last): File "/Users/ebrevdo/dev/scidata/test/test_dataset.py", line 234, in test_labeled_by {'units': 'days since 2000-01-01'}) File "/Users/ebrevdo/dev/scidata/src/xray/dataset.py", line 464, in create_variable return self.add_variable(name, v) File "/Users/ebrevdo/dev/scidata/src/xray/dataset.py", line 534, in add_variable return self.set_variable(name, var) File "/Users/ebrevdo/dev/scidata/src/xray/dataset.py", line 595, in set_variable self.indices.build_index(name) File "/Users/ebrevdo/dev/scidata/src/xray/dataset.py", line 109, in build_index self.cache[key] = self.dataset._create_index(key) File "/Users/ebrevdo/dev/scidata/src/xray/dataset.py", line 224, in _create_index attr.get('calendar')) File "/Users/ebrevdo/dev/scidata/src/xray/utils.py", line 106, in num2datetimeindex dates = first_time_delta * num_delta + np.datetime64(first_dates[0]) TypeError: ufunc 'multiply' not supported for the input types, and the inputs could not be safely coerced to any supported types according to the casting rule 'safe'

ERROR: test (test.test_utils.TestNum2DatetimeIndex)

Traceback (most recent call last): File "/Users/ebrevdo/dev/scidata/test/test_utils.py", line 68, in test actual = utils.num2datetimeindex(num_dates, units, calendar) File "/Users/ebrevdo/dev/scidata/src/xray/utils.py", line 106, in num2datetimeindex dates = first_time_delta * num_delta + np.datetime64(first_dates[0]) TypeError: ufunc 'multiply' not supported for the input types, and the inputs could not be safely coerced to any supported types according to the casting rule 'safe'

FAIL: test_dump_and_open_dataset (test.test_dataset.ScipyDataTest)

Traceback (most recent call last): File "/Users/ebrevdo/dev/scidata/test/test_dataset.py", line 404, in test_dump_and_open_dataset self.assertEquals(expected, actual) AssertionError: <xray.Dataset (time: 1000, @dim1: 100, @dim2: 50, @dim3: 10): var1 var2 var3> != <xray.Dataset (@dim2: 50, @dim3: 10, @dim1: 100, time: 1000): var1 var3 var2>

FAIL: test_aggregate (test.test_dataset_array.TestDatasetArray)

Traceback (most recent call last): File "/Users/ebrevdo/dev/scidata/test/test_dataset_array.py", line 213, in test_aggregate self.assertViewEqual(expected, actual) File "/Users/ebrevdo/dev/scidata/test/test_dataset_array.py", line 9, in assertViewEqual self.assertEqual(dv1.dataset, dv2.dataset) AssertionError: <xray.Dataset (@x: 10, @abc: 3): foo> != <xray.Dataset (@x: 10, @abc: 3): foo>

FAIL: test_groupby (test.test_dataset_array.TestDatasetArray)

Traceback (most recent call last): File "/Users/ebrevdo/dev/scidata/test/test_dataset_array.py", line 189, in test_groupby grouped.collapse(np.sum, dimension=None)) File "/Users/ebrevdo/dev/scidata/test/test_dataset_array.py", line 9, in assertViewEqual self.assertEqual(dv1.dataset, dv2.dataset) AssertionError: <xray.Dataset (@abc: 3): foo> != <xray.Dataset (@abc: 3): foo>

FAIL: test_intersection (test.test_dataset_array.TestDatasetArray)

Traceback (most recent call last): File "/Users/ebrevdo/dev/scidata/test/test_dataset_array.py", line 240, in test_intersection self.assertViewEqual(dv1, self.dv[:5]) File "/Users/ebrevdo/dev/scidata/test/test_dataset_array.py", line 9, in assertViewEqual self.assertEqual(dv1.dataset, dv2.dataset) AssertionError: <xray.Dataset (@x: 5, @y: 20): foo> != <xray.Dataset (@x: 5, @y: 20): foo>

FAIL: test_labeled_by (test.test_dataset_array.TestDatasetArray)

Traceback (most recent call last): File "/Users/ebrevdo/dev/scidata/test/test_dataset_array.py", line 75, in test_labeled_by self.assertViewEqual(self.dv, self.dv.labeled_by(x=slice(None))) File "/Users/ebrevdo/dev/scidata/test/test_dataset_array.py", line 9, in assertViewEqual self.assertEqual(dv1.dataset, dv2.dataset) AssertionError: <xray.Dataset (@x: 10, @y: 20): foo> != <xray.Dataset (@x: 10, @y: 20): foo>

FAIL: test_loc (test.test_dataset_array.TestDatasetArray)

Traceback (most recent call last): File "/Users/ebrevdo/dev/scidata/test/test_dataset_array.py", line 81, in test_loc self.assertViewEqual(self.dv[:3], self.dv.loc[:'c']) File "/Users/ebrevdo/dev/scidata/test/test_dataset_array.py", line 9, in assertViewEqual self.assertEqual(dv1.dataset, dv2.dataset) AssertionError: <xray.Dataset (@x: 3, @y: 20): foo> != <xray.Dataset (@x: 3, @y: 20): foo>

---

Ran 100 tests in 1.248s

FAILED (failures=6, errors=9, skipped=6)