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2 changes: 2 additions & 0 deletions xarray/core/ops.py
Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,8 @@
# wrapped in an Variable/DataArray
NUMPY_UNARY_METHODS = ['astype', 'argsort', 'clip', 'conj', 'conjugate']
PANDAS_UNARY_FUNCTIONS = ['isnull', 'notnull']
if pd.__version__ >= "0.21":
PANDAS_UNARY_FUNCTIONS.extend(['isna', 'notna'])
# methods which remove an axis
REDUCE_METHODS = ['all', 'any']
NAN_REDUCE_METHODS = ['argmax', 'argmin', 'max', 'min', 'mean', 'prod', 'sum',
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