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BUG: Fix df.loc slice support #18703

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BUG: Fix df.loc slice support #18703

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a0f61ce
BUG: Fix df.loc slice support
Licht-T Dec 9, 2017
4608a36
TST: Add tests for loc/iloc slicing
Licht-T Dec 9, 2017
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4 changes: 3 additions & 1 deletion pandas/core/indexes/multi.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2097,7 +2097,9 @@ def _maybe_to_slice(loc):
mask[loc] = True
return mask

if not isinstance(key, tuple):
if isinstance(key, slice):
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can u add some comments here

return key
elif not isinstance(key, tuple):
loc = self._get_level_indexer(key, level=0)
return _maybe_to_slice(loc)

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18 changes: 18 additions & 0 deletions pandas/tests/indexing/test_multiindex.py
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Expand Up @@ -239,6 +239,15 @@ def test_iloc_getitem_multiindex(self):
xp = mi_labels.ix['j'].ix[:, 'j'].ix[0, 0]
assert rs == xp

# GH8856
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make separate test

s = pd.Series(np.arange(10),
pd.MultiIndex.from_product(([0, 1], list('abcde'))))
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can u add several cases using slices

also if other testing of slice u can pull to this section

result = s.iloc[::4]
expected = pd.Series(np.array([0, 4, 8]),
MultiIndex(levels=[[0, 1], list('ade')],
labels=[[0, 0, 1], [0, 2, 1]]))
tm.assert_series_equal(result, expected)

def test_loc_multiindex(self):

mi_labels = DataFrame(np.random.randn(3, 3),
Expand Down Expand Up @@ -278,6 +287,15 @@ def test_loc_multiindex(self):
xp = mi_int.ix[4]
tm.assert_frame_equal(rs, xp)

# GH8856
s = pd.Series(np.arange(10),
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is this a duplicate of the other test?

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(.iloc vs. .loc)

pd.MultiIndex.from_product(([0, 1], list('abcde'))))
result = s.loc[::4]
expected = pd.Series(np.array([0, 4, 8]),
MultiIndex(levels=[[0, 1], ['a', 'd', 'e']],
labels=[[0, 0, 1], [0, 2, 1]]))
tm.assert_series_equal(result, expected)

def test_getitem_partial_int(self):
# GH 12416
# with single item
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