BUG: unstack multiple levels bug described in #451

Author: wesm

RELEASE.rst

@@ -38,7 +38,6 @@ pandas 0.6.1
     is about 3x faster than df[column][row] by handling fewer cases (GH #437)
   - Add Qt table widget to sandbox (PR #435)
 
-
 **Improvements to existing features**
 
   - Improve memory usage of `DataFrame.describe` (do not copy data
@@ -49,6 +48,7 @@ pandas 0.6.1
   - Exclude non-numeric types in DataFrame.{corr, cov}
   - Override Index.astype to enable dtype casting (GH #412)
   - Use same float formatting function for Series.__repr__ (PR #420)
+  - Use available console width to output DataFrame columns (PR #453)
 
 **Bug fixes**
 
@@ -62,6 +62,7 @@ pandas 0.6.1
   - Fix groupby exception raised with as_index=False and single column selected
     (GH #421)
   - Implement DateOffset.__ne__ causing downstream bug (GH #456)
+  - Fix __doc__-related issue when converting py -> pyo with py2exe
 
 Thanks
 ------

pandas/core/frame.py

@@ -2054,8 +2054,12 @@ def unstack(self, level=-1):
         from pandas.core.reshape import unstack
         if isinstance(level, (tuple, list)):
             result = self
-            for lev in level:
+            to_unstack = level
+            while to_unstack:
+                lev = to_unstack[0]
                 result = unstack(result, lev)
+                to_unstack = [other - 1 if other > lev else other
+                              for other in to_unstack[1:]]
             return result
         else:
             return unstack(self, level)

pandas/tests/test_multilevel.py

@@ -469,8 +469,16 @@ def test_stack_unstack_multiple(self):
         restacked = restacked.sortlevel(0)
 
         assert_frame_equal(restacked, self.ymd)
-        self.assertEquals(restacked.index.names,
-                          self.ymd.index.names)
+        self.assertEquals(restacked.index.names, self.ymd.index.names)
+
+        # GH #451
+        unstacked = self.ymd.unstack([1, 2])
+        expected = self.ymd.unstack(1).unstack(1)
+        assert_frame_equal(unstacked, expected)
+
+        unstacked = self.ymd.unstack([2, 1])
+        expected = self.ymd.unstack(2).unstack(1)
+        assert_frame_equal(unstacked, expected)
 
     def test_groupby_transform(self):
         s = self.frame['A']