Prevented unlimited recursive aggregation

pandas-dev · TomAugspurger · May 17, 2018 · May 15, 2018 · May 15, 2018 · May 15, 2018
commit ee782642e1626c3f15b94c3aa12c30f9119ab365
diff --git a/pandas/core/base.py b/pandas/core/base.py
@@ -590,9 +590,9 @@ def _aggregate_multiple_funcs(self, arg, _level, _axis):
 
         # multiples
         else:
-            for col in obj:
+            for index, col in enumerate(obj):
                 try:
-                    colg = self._gotitem(col, ndim=1, subset=obj[col])
+                    colg = self._gotitem(col, ndim=1, subset=obj.iloc[:, [index]])
                     results.append(colg.aggregate(arg))
                     keys.append(col)
                 except (TypeError, DataError):
@@ -675,7 +675,6 @@ def _gotitem(self, key, ndim, subset=None):
         subset : object, default None
             subset to act on
         """
-
         # create a new object to prevent aliasing
         if subset is None:
             subset = self.obj

diff --git a/pandas/core/frame.py b/pandas/core/frame.py
@@ -5748,7 +5748,7 @@ def _gotitem(self, key, ndim, subset=None):
             subset = self
 
         # TODO: _shallow_copy(subset)?
-        return self[key]
+        return subset[key]
 
     _agg_doc = dedent("""
     The aggregation operations are always performed over an axis, either the