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BUG/TST: test for groupby max nan subselection bug #7393

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Merged
merged 1 commit into from
Jun 8, 2014
Merged

BUG/TST: test for groupby max nan subselection bug #7393

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11 changes: 11 additions & 0 deletions pandas/tests/test_groupby.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4369,6 +4369,17 @@ def test_ops_general(self):
exc.args += ('operation: %s' % op,)
raise

def test_max_nan_bug(self):
raw = """,Date,app,File
2013-04-23,2013-04-23 00:00:00,,log080001.log
2013-05-06,2013-05-06 00:00:00,,log.log
2013-05-07,2013-05-07 00:00:00,OE,xlsx"""
df = pd.read_csv(StringIO(raw), parse_dates=[0])
gb = df.groupby('Date')
r = gb[['File']].max()
e = gb['File'].max().to_frame()
tm.assert_frame_equal(r, e)
self.assertFalse(r['File'].isnull().any())

def assert_fp_equal(a, b):
assert (np.abs(a - b) < 1e-12).all()
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