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TST: Add tests for single group #13561

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Jul 5, 2016
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TST: Add tests for single group #13561

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17 changes: 13 additions & 4 deletions pandas/tests/test_groupby.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2085,8 +2085,8 @@ def test_groupby_head_tail(self):
assert_frame_equal(df.loc[[0, 2]], g_not_as.head(1))
assert_frame_equal(df.loc[[1, 2]], g_not_as.tail(1))

empty_not_as = DataFrame(columns=df.columns, index=pd.Index(
[], dtype=df.index.dtype))
empty_not_as = DataFrame(columns=df.columns,
index=pd.Index([], dtype=df.index.dtype))
empty_not_as['A'] = empty_not_as['A'].astype(df.A.dtype)
empty_not_as['B'] = empty_not_as['B'].astype(df.B.dtype)
assert_frame_equal(empty_not_as, g_not_as.head(0))
Expand Down Expand Up @@ -4549,6 +4549,15 @@ def test_groupby_with_empty(self):
grouped = series.groupby(grouper)
assert next(iter(grouped), None) is None

def test_groupby_with_single_column(self):
df = pd.DataFrame({'a': list('abssbab')})
tm.assert_frame_equal(df.groupby('a').get_group('a'), df.iloc[[0, 5]])
# GH 13530
exp = pd.DataFrame([], index=pd.Index(['a', 'b', 's'], name='a'))
tm.assert_frame_equal(df.groupby('a').count(), exp)
tm.assert_frame_equal(df.groupby('a').sum(), exp)
tm.assert_frame_equal(df.groupby('a').nth(1), exp)

def test_groupby_with_small_elem(self):
# GH 8542
# length=2
Expand Down Expand Up @@ -4989,8 +4998,8 @@ def test_cumcount_empty(self):
ge = DataFrame().groupby(level=0)
se = Series().groupby(level=0)

e = Series(dtype='int64'
) # edge case, as this is usually considered float
# edge case, as this is usually considered float
e = Series(dtype='int64')

assert_series_equal(e, ge.cumcount())
assert_series_equal(e, se.cumcount())
Expand Down