issue_comments

Don't worry about it, this happens. If you can't figure out an immediate fix, please just mark the tests as "xfail" so they don't block other PRs. I'm pretty sure the issue here is in the tests, not your fix.

On Thu, May 9, 2019 at 9:08 AM Martin Pletcher notifications@github.com wrote:

Sure. I'm looking into it now.

Sorry about that.

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It seems xarray (mistakenly?) relies on the immutability of index data somewhere else, and hence reuses the same pandas.Index object for data in both data and coords.

Can you take a look at the test failures on Windows? These seem to be due to your charge: ``` ================================== FAILURES =================================== __ TestDataArray.test_copy_coords[False-expected_orig1] _____ self = <xarray.tests.test_dataarray.TestDataArray object at 0x000000AAE0637F28> deep = False expected_orig = <xarray.DataArray 'a' (a: 2)> array([999, 2]) Coordinates: * a (a) int32 999 2 @pytest.mark.parametrize('deep, expected_orig', [ [True, xr.DataArray(xr.IndexVariable('a', np.array([1, 2])), coords={'a': [1, 2]}, dims=['a'])], [False, xr.DataArray(xr.IndexVariable('a', np.array([999, 2])), coords={'a': [999, 2]}, dims=['a'])]]) def test_copy_coords(self, deep, expected_orig): da = xr.DataArray( np.ones([2, 2, 2]), coords={'a': [1, 2], 'b': ['x', 'y'], 'c': [0, 1]}, dims=['a', 'b', 'c']) da_cp = da.copy(deep) da_cp['a'].data[0] = 999

    expected_cp = xr.DataArray(
        xr.IndexVariable('a', np.array([999, 2])),
        coords={'a': [999, 2]}, dims=['a'])

  assert_identical(da_cp['a'], expected_cp)

xarray\tests\test_dataarray.py:3342:

a = <xarray.DataArray 'a' (a: 2)> array([1, 2]) Coordinates: * a (a) int32 1 2 b = <xarray.DataArray 'a' (a: 2)> array([999, 2]) Coordinates: * a (a) int32 999 2 def assert_identical(a, b):

  xarray.testing.assert_identical(a, b)

E AssertionError: Left and right DataArray objects are not identical E
E Differing values: E L E array([1, 2]) E R E array([999, 2]) E Differing coordinates: E L * a (a) int32 1 2 E R * a (a) int32 999 2 xarray\tests__init__.py:195: AssertionError ___ TestDataset.test_copy_coords[False-expected_orig1] ______ self = <xarray.tests.test_dataset.TestDataset object at 0x000000AAE05256A0> deep = False expected_orig = <xarray.DataArray 'a' (a: 2)> array([999, 2]) Coordinates: * a (a) int32 999 2 @pytest.mark.parametrize('deep, expected_orig', [ [True, xr.DataArray(xr.IndexVariable('a', np.array([1, 2])), coords={'a': [1, 2]}, dims=['a'])], [False, xr.DataArray(xr.IndexVariable('a', np.array([999, 2])), coords={'a': [999, 2]}, dims=['a'])]]) def test_copy_coords(self, deep, expected_orig): ds = xr.DataArray( np.ones([2, 2, 2]), coords={'a': [1, 2], 'b': ['x', 'y'], 'c': [0, 1]}, dims=['a', 'b', 'c'], name='value').to_dataset() ds_cp = ds.copy(deep=deep) ds_cp.coords['a'].data[0] = 999

    expected_cp = xr.DataArray(
        xr.IndexVariable('a', np.array([999, 2])),
        coords={'a': [999, 2]}, dims=['a'])

  assert_identical(ds_cp.coords['a'], expected_cp)

xarray\tests\test_dataset.py:1993:

a = <xarray.DataArray 'a' (a: 2)> array([1, 2]) Coordinates: * a (a) int32 1 2 b = <xarray.DataArray 'a' (a: 2)> array([999, 2]) Coordinates: * a (a) int32 999 2 def assert_identical(a, b):

  xarray.testing.assert_identical(a, b)

E AssertionError: Left and right DataArray objects are not identical E
E Differing values: E L E array([1, 2]) E R E array([999, 2]) E Differing coordinates: E L * a (a) int32 1 2 E R * a (a) int32 999 2 xarray\tests__init__.py:195: AssertionError ============================== warnings summary =============================== ```