⚠️ Nightly upstream-dev CI failed ⚠️

[github-actions]

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Python 3.9 Test Summary Info

FAILED xarray/tests/test_variable.py::TestVariable::test_pandas_period_index
FAILED xarray/tests/test_variable.py::TestVariableWithDask::test_pandas_period_index
FAILED xarray/tests/test_variable.py::TestIndexVariable::test_pandas_period_index

[mathause]

The test failures can be reproduced with:

import pandas as pd
import numpy as np
np.array(0) == pd.Period("2000", freq="B")

This returns False in pandas 1.3.4 but raises TypeError: iteration over a 0-d array in pandas master. I think the culprit is pandas-dev/pandas#44182 which added a code path for numpy arrays in Period.__richcmp__.

The failure happens in

xarray/xarray/tests/test_variable.py

Line 326 in 3e442e7

assert v[0] == pd.Period("2000", freq="B")

and we could fix it with

-        assert v[0] == pd.Period("2000", freq="B")
+        assert v[0:1] == pd.Period("2000", freq="B")

[mathause]

Should get fixed upstream: pandas-dev/pandas#44285