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BUG: read_csv does not set index name on an empty DataFrame #10302

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Merged
merged 1 commit into from
Jun 7, 2015
Merged

BUG: read_csv does not set index name on an empty DataFrame #10302

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1 change: 1 addition & 0 deletions doc/source/whatsnew/v0.16.2.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -142,6 +142,7 @@ Bug Fixes
- Bug in `plot` not defaulting to matplotlib `axes.grid` setting (:issue:`9792`)

- Bug in ``Series.align`` resets ``name`` when ``fill_value`` is specified (:issue:`10067`)
- Bug in ``read_csv`` causing index name not to be set on an empty DataFrame (:issue:`10184`)
- Bug in ``SparseSeries.abs`` resets ``name`` (:issue:`10241`)


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4 changes: 3 additions & 1 deletion pandas/io/parsers.py
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Expand Up @@ -1170,7 +1170,9 @@ def read(self, nrows=None):
data = self._reader.read(nrows)
except StopIteration:
if nrows is None:
return None, self.names, {}
return _get_empty_meta(self.orig_names,
self.index_col,
self.index_names)
else:
raise

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7 changes: 7 additions & 0 deletions pandas/io/tests/test_parsers.py
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Expand Up @@ -2294,6 +2294,13 @@ def test_chunk_begins_with_newline_whitespace(self):
result = self.read_csv(StringIO(data), header=None)
self.assertEqual(len(result), 2)

def test_empty_with_index(self):
# GH 10184
data = 'x,y'
result = self.read_csv(StringIO(data), index_col=0)
expected = DataFrame([], columns=['y'], index=Index([], name='x'))
tm.assert_frame_equal(result, expected)


class TestPythonParser(ParserTests, tm.TestCase):
def test_negative_skipfooter_raises(self):
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