为什么UnicodeEncodeError只在emacs的python shell中引发？

>>> sys.version
sys.version
'3.2.3 (v3.2.3:3d0686d90f55,Apr 10 2012,11:25:50) n[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)]'
>>> sys.getdefaultencoding()
sys.getdefaultencoding()
'utf-8'
>>> data
data
'spxe4m'
>>> print(data)
print(data)
Traceback (most recent call last):
  File "<stdin>",line 1,in <module>
UnicodeEncodeError: 'ascii' codec can't encode character 'xe4' in position 2: ordinal not in range(128)

在终端：

~$python3
Python 3.2.3 (v3.2.3:3d0686d90f55,11:25:50)
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help","copyright","credits" or "license" for more information.
>>> data='spxe4m'
>>> sys.getdefaultencoding()
'utf-8'
>>> data
'sp?m'
>>> print(data)
sp?m

有没有人有关于Python的unicode字符串在终端中工作但在emacs中不工作的原因的想法

(emacs的版本信息：2012-08-27的GNU Emacs 24.2.1(x86_64-apple-darwin,NS apple-appkit-1038.36)bob.porkrind.org)