Merge pull request #8715 from jreback/panel_index

BUG: Bug in Panel indexing with a list-like (GH8710)

Author: jreback

doc/source/whatsnew/v0.15.1.txt

@@ -188,7 +188,7 @@ Bug Fixes
 - Bug in groupby-transform with a Categorical (:issue:`8623`)
 - Bug in duplicated/drop_duplicates with a Categorical (:issue:`8623`)
 - Bug in ``Categorical`` reflected comparison operator raising if the first argument was a numpy array scalar (e.g. np.int64) (:issue:`8658`)
-
+- Bug in Panel indexing with a list-like (:issue:`8710`)
 
 
 

pandas/core/panel.py

@@ -29,7 +29,7 @@
 import pandas.core.ops as ops
 import pandas.core.nanops as nanops
 import pandas.computation.expressions as expressions
-
+from pandas import lib
 
 _shared_doc_kwargs = dict(
     axes='items, major_axis, minor_axis',
@@ -253,7 +253,9 @@ def from_dict(cls, data, intersect=False, orient='items', dtype=None):
     def __getitem__(self, key):
         if isinstance(self._info_axis, MultiIndex):
             return self._getitem_multilevel(key)
-        return super(Panel, self).__getitem__(key)
+        if lib.isscalar(key):
+            return super(Panel, self).__getitem__(key)
+        return self.ix[key]
 
     def _getitem_multilevel(self, key):
         info = self._info_axis

pandas/tests/test_indexing.py

@@ -2325,6 +2325,30 @@ def test_panel_getitem(self):
         test1 = panel.ix[:, "2002"]
         tm.assert_panel_equal(test1,test2)
 
+        # GH8710
+        # multi-element getting with a list
+        panel = tm.makePanel()
+
+        expected = panel.iloc[[0,1]]
+
+        result = panel.loc[['ItemA','ItemB']]
+        tm.assert_panel_equal(result,expected)
+
+        result = panel.loc[['ItemA','ItemB'],:,:]
+        tm.assert_panel_equal(result,expected)
+
+        result = panel[['ItemA','ItemB']]
+        tm.assert_panel_equal(result,expected)
+
+        result = panel.loc['ItemA':'ItemB']
+        tm.assert_panel_equal(result,expected)
+
+        result = panel.ix['ItemA':'ItemB']
+        tm.assert_panel_equal(result,expected)
+
+        result = panel.ix[['ItemA','ItemB']]
+        tm.assert_panel_equal(result,expected)
+
     def test_panel_setitem(self):
 
         # GH 7763