32-bit compat

Author: TomAugspurger

pandas/core/groupby/grouper.py

@@ -610,7 +610,7 @@ def is_in_obj(gpr):
         raise ValueError('No group keys passed!')
     elif len(groupings) == 0:
         groupings.append(Grouping(Index([], dtype='int'),
-                                  np.array([], dtype='int')))
+                                  np.array([], dtype=np.intp)))
 
     # create the internals grouper
     grouper = BaseGrouper(group_axis, groupings, sort=sort, mutated=mutated)

pandas/tests/groupby/test_grouping.py

@@ -580,10 +580,10 @@ def test_groupby_empty(self):
         # check group properties
         assert len(gr.grouper.groupings) == 1
         tm.assert_numpy_array_equal(gr.grouper.group_info[0],
-                                    np.array([], dtype='int'))
+                                    np.array([], dtype=np.intp))
 
         tm.assert_numpy_array_equal(gr.grouper.group_info[1],
-                                    np.array([], dtype='int'))
+                                    np.array([], dtype=np.intp))
 
         assert gr.grouper.group_info[2] == 0