Accessing worksheet with unicode names

I have an excel file with unicode names for the worksheets

wb.get_sheet_names()

output:

[u'\u4efb\u52a11',
 u'\u4efb\u52a12',
 u'\u4efb\u52a13A',
 u'\u4efb\u52a13B',
 u'\u4efb\u52a14-A',
 u'\u4efb\u52a14-B',
 u'\u4efb\u52a15-A',
 u'\u4efb\u52a15-B']

Then I did this to access the worksheet:

sheet1 = wb.get_sheet_names()[0]
wb[sheet1]

Here is the error:

---------------------------------------------------------------------------
UnicodeEncodeError                        Traceback (most recent call last)
/Users/cheng/.virtualenvs/edge/lib/python2.7/site-packages/IPython/core/formatters.pyc in __call__(self, obj)
    695                 type_pprinters=self.type_printers,
    696                 deferred_pprinters=self.deferred_printers)
--> 697             printer.pretty(obj)
    698             printer.flush()
    699             return stream.getvalue()

/Users/cheng/.virtualenvs/edge/lib/python2.7/site-packages/IPython/lib/pretty.pyc in pretty(self, obj)
    381                             if callable(meth):
    382                                 return meth(obj, self, cycle)
--> 383             return _default_pprint(obj, self, cycle)
    384         finally:
    385             self.end_group()

/Users/cheng/.virtualenvs/edge/lib/python2.7/site-packages/IPython/lib/pretty.pyc in _default_pprint(obj, p, cycle)
    501     if _safe_getattr(klass, '__repr__', None) not in _baseclass_reprs:
    502         # A user-provided repr. Find newlines and replace them with p.break_()
--> 503         _repr_pprint(obj, p, cycle)
    504         return
    505     p.begin_group(1, '<')

/Users/cheng/.virtualenvs/edge/lib/python2.7/site-packages/IPython/lib/pretty.pyc in _repr_pprint(obj, p, cycle)
    683     """A pprint that just redirects to the normal repr function."""
    684     # Find newlines and replace them with p.break_()
--> 685     output = repr(obj)
    686     for idx,output_line in enumerate(output.splitlines()):
    687         if idx:

UnicodeEncodeError: 'ascii' codec can't encode characters in position 12-13: ordinal not in range(128)

Then I tried this:

wb[name1.encode('utf8')]

The output:

---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
<ipython-input-72-6648e632677d> in <module>()
----> 1 wb[name1.encode('utf8')]

/Users/cheng/.virtualenvs/edge/lib/python2.7/site-packages/openpyxl/workbook/workbook.pyc in __getitem__(self, key)
    231             if sheet.title == key:
    232                 return sheet
--> 233         raise KeyError("Worksheet {0} does not exist.".format(key))
    234 
    235     def __delitem__(self, key):

KeyError: 'Worksheet \xe4\xbb\xbb\xe5\x8a\xa11 does not exist.'

I know this has something to do with unicode vs str, what am I suppose to do to access the worksheet?

Thanks!

P.S. versions I used: openpyxl (2.2.5), python(2.7.9)

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