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BUG: fixed index power operation #14996

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BUG: fixed index power operation #14996

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a6c9458
BUG: fixed index power operation
kamal94 Dec 27, 2016
14c47a8
DOC: updated wording of a previous fix
kamal94 Dec 27, 2016
66c2338
Merge branch 'master' of git://github.com/pandas-dev/pandas
kamal94 Dec 27, 2016
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1 change: 1 addition & 0 deletions doc/source/whatsnew/v0.20.0.txt
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Expand Up @@ -282,6 +282,7 @@ Performance Improvements
Bug Fixes
~~~~~~~~~

- Bug in ``Index`` power operations with reversed operands(:issue:`14973`)
- Bug in ``TimedeltaIndex`` addition where overflow was being allowed without error (:issue:`14816`)
- Bug in ``DataFrame`` construction in which unsigned 64-bit integer elements were being converted to objects (:issue:`14881`)
- Bug in ``astype()`` where ``inf`` values were incorrectly converted to integers. Now raises error now with ``astype()`` for Series and DataFrames (:issue:`14265`)
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4 changes: 3 additions & 1 deletion pandas/indexes/base.py
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Expand Up @@ -3534,7 +3534,9 @@ def _evaluate_numeric_binop(self, other):
operator.sub, '__sub__', reversed=True)
cls.__mul__ = cls.__rmul__ = _make_evaluate_binop(
operator.mul, '__mul__')
cls.__pow__ = cls.__rpow__ = _make_evaluate_binop(
cls.__rpow__ = _make_evaluate_binop(
operator.pow, '__pow__', reversed=True)
cls.__pow__ = _make_evaluate_binop(
operator.pow, '__pow__')
cls.__mod__ = _make_evaluate_binop(
operator.mod, '__mod__')
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9 changes: 9 additions & 0 deletions pandas/tests/indexes/test_numeric.py
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Expand Up @@ -105,6 +105,15 @@ def test_numeric_compat(self):
for r, e in zip(result, expected):
tm.assert_index_equal(r, e)

# test power calculations both ways, GH 14973
expected = pd.Float64Index(2.0**idx.values)
result = 2.0**idx
tm.assert_index_equal(result, expected)

expected = pd.Float64Index(idx.values**2.0)
result = idx**2.0
tm.assert_index_equal(result, expected)

def test_explicit_conversions(self):

# GH 8608
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