Pass ndim

Author: TomAugspurger

pandas/core/internals/blocks.py

@@ -662,16 +662,14 @@ def _astype(self, dtype, copy=False, errors='raise', values=None,
                     pass
 
             newb = make_block(values, placement=self.mgr_locs,
-                              klass=klass)
+                              klass=klass, ndim=self.ndim)
         except:
             if errors == 'raise':
                 raise
             newb = self.copy() if copy else self
 
         if newb.is_numeric and self.is_numeric:
-            # use values.shape, rather than newb.shape, as newb.shape
-            # may be incorrect for ExtensionBlocks.
-            if values.shape != self.shape:
+            if newb.shape != self.shape:
                 raise TypeError(
                     "cannot set astype for copy = [{copy}] for dtype "
                     "({dtype} [{itemsize}]) with smaller itemsize than "