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Make the sel error more descriptive when method is unset #6774

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Merged
merged 3 commits into from
Jul 12, 2022
Merged

Make the sel error more descriptive when method is unset #6774

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e03ae4a
Make the sel error more descriptive when `method` is unset
jsignell Jul 11, 2022
bd85797
Apply suggestions from code review
jsignell Jul 12, 2022
ecc3683
Merge branch 'main' into sel-error-message
jsignell Jul 12, 2022
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9 changes: 8 additions & 1 deletion xarray/core/indexes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -404,7 +404,14 @@ def sel(
f"not all values found in index {coord_name!r}"
)
else:
indexer = self.index.get_loc(label_value)
try:
indexer = self.index.get_loc(label_value)
except KeyError as e:
raise KeyError(
f"not all values found in index {coord_name!r}. "
"Try setting the `method` keyword argument (example: method='nearest')."
) from e

elif label_array.dtype.kind == "b":
indexer = label_array
else:
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3 changes: 3 additions & 0 deletions xarray/tests/test_dataarray.py
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Expand Up @@ -1054,6 +1054,9 @@ def test_sel_no_index(self) -> None:
def test_sel_method(self) -> None:
data = DataArray(np.random.randn(3, 4), [("x", [0, 1, 2]), ("y", list("abcd"))])

with pytest.raises(KeyError, match="Try setting the `method`"):
data.sel(y="ab")

expected = data.sel(y=["a", "b"])
actual = data.sel(y=["ab", "ba"], method="pad")
assert_identical(expected, actual)
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