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Error with .drop([]) on non-unique index #16428

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Merged
merged 4 commits into from
May 24, 2017
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Error with .drop([]) on non-unique index #16428

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8d0285a
BUG: ensure that labels are objects, if they are empty they default t…
lkirk May 22, 2017
0bdc8ed
BUG: fix-drop-on-non-unique-index
lkirk May 22, 2017
eb3ee0e
fix note in whatsnew
lkirk May 23, 2017
1973925
adds test to drop blank list
lkirk May 23, 2017
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2 changes: 2 additions & 0 deletions doc/source/whatsnew/v0.20.2.txt
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Expand Up @@ -93,3 +93,5 @@ Categorical

Other
^^^^^

- Fix ``pd.drop([])`` for dataframes with non-unique indices (:issue:`16270`)
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Bug in df.drop([]) for DataFrame with non-unique indices

3 changes: 2 additions & 1 deletion pandas/core/generic.py
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Expand Up @@ -12,6 +12,7 @@
from pandas._libs import tslib, lib
from pandas.core.dtypes.common import (
_ensure_int64,
_ensure_object,
needs_i8_conversion,
is_scalar,
is_number,
Expand Down Expand Up @@ -2076,7 +2077,7 @@ def drop(self, labels, axis=0, level=None, inplace=False, errors='raise'):
result = dropped

else:
labels = com._index_labels_to_array(labels)
labels = _ensure_object(com._index_labels_to_array(labels))
if level is not None:
if not isinstance(axis, MultiIndex):
raise AssertionError('axis must be a MultiIndex')
Expand Down