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BUG/API: allow get_indexer to work with nans #7855

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BUG/API: allow get_indexer to work with nans #7855

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6 changes: 6 additions & 0 deletions pandas/core/index.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2133,6 +2133,12 @@ def isin(self, values):
return lib.ismember_nans(self._array_values(), value_set,
isnull(list(value_set)).any())

def get_indexer(self, values, method=None, limit=None):
result = super(Float64Index, self).get_indexer(values, method=method,
limit=limit)
result[result == -1] = self._nan_idxs
return result


class MultiIndex(Index):

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12 changes: 12 additions & 0 deletions pandas/tests/test_index.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1049,6 +1049,18 @@ def test_astype_from_object(self):
tm.assert_equal(result.dtype, expected.dtype)
tm.assert_index_equal(result, expected)

def test_get_indexer_nans(self):
index = Index([1, 2, np.nan])
result = index.get_indexer([np.nan])
np.testing.assert_array_equal(result, np.array([2]))

index = Index([1, np.nan, 2, np.nan])
with tm.assertRaisesRegexp(InvalidIndexError, 'Reindexing.*valid.*'):
index.get_indexer([np.nan])

index = Index([1, np.nan, 2])
result = index.get_indexer([np.nan, np.nan])
np.testing.assert_array_equal(result, np.array([1, 1]))

class TestInt64Index(tm.TestCase):
_multiprocess_can_split_ = True
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