UnicodeEncodeError in index.summary()

idx=pd.Index([u'\u05d3\u05e4\u05e0\u05d4',u'\u05d3\u05e4\u05e0\u05d4'])
idx.summary()

---

UnicodeEncodeError Traceback (most recent call last)
in ()
1 idx=pd.Index([u'\u05d3\u05e4\u05e0\u05d4',u'\u05d3\u05e4\u05e0\u05d4'])
----> 2 idx.summary()
3

/usr/local/lib/python2.7/dist-packages/pandas-0.9.0.dev_37f4ded-py2.7-linux-x86_64.egg/pandas/core/index.pyc in summary(self, name)
197 def summary(self, name=None):
198 if len(self) > 0:
--> 199 index_summary = ', %s to %s' % (str(self[0]), str(self[-1]))
200 else:
201 index_summary = ''

UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-3: ordinal not in range(128)