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BUG: TypeError in index coercion #12916

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BUG: TypeError in index coercion #12916

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2 changes: 2 additions & 0 deletions doc/source/whatsnew/v0.18.1.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -333,3 +333,5 @@ Bug Fixes


- Bug in ``fill_value`` is ignored if the argument to a binary operator is a constant (:issue `12723`)

- Bug in index coercion when falling back from ```RangeIndex``` construction (:issue:`12893`)
2 changes: 1 addition & 1 deletion pandas/indexes/multi.py
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Expand Up @@ -666,7 +666,7 @@ def get_level_values(self, level):
filled = algos.take_1d(unique.values, labels,
fill_value=unique._na_value)
_simple_new = unique._simple_new
values = _simple_new(filled, self.names[num],
values = _simple_new(filled, name=self.names[num],
freq=getattr(unique, 'freq', None),
tz=getattr(unique, 'tz', None))
return values
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9 changes: 9 additions & 0 deletions pandas/tests/indexes/test_multi.py
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Expand Up @@ -2130,3 +2130,12 @@ def test_partial_string_timestamp_multiindex(self):
# Slicing date on first level should break (of course)
with assertRaises(KeyError):
df_swap.loc['2016-01-01']

def test_rangeindex_fallback_coercion_bug(self):
# GH 12893
foo = pd.DataFrame(np.arange(100).reshape((10, 10)))
bar = pd.DataFrame(np.arange(100).reshape((10, 10)))
df = pd.concat({'foo': foo.stack(), 'bar': bar.stack()}, axis=1)
df.index.names = ['fizz', 'buzz']
expected = [i for i in range(10) for j in range(10)]
self.assertTrue((df.index.get_level_values('fizz') == expected).all())