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add a test to check zero index array do not error #25856

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add a test to check zero index array do not error #25856

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8 changes: 8 additions & 0 deletions pandas/tests/indexing/test_indexing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -855,6 +855,14 @@ def test_no_reference_cycle(self):
del df
assert wr() is None

def test_no_error_for_zero_index(self):
# GH-21946
df = DataFrame([[1, 2], [3, 4]], columns=['a', 'b'])
ar = np.array(0)
try:
tm.assert_frame_equal(df.iloc[ar], df.iloc[0])
except TypeError:
pytest.fail("Unexpected TypeError, should be first element of array.")

class TestSeriesNoneCoercion(object):
EXPECTED_RESULTS = [
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