Traceback (most recent call last):
  File "app.py", line 13, in <module>
    workbook.save("result.xls")
  File "/Users/zach/Work/upload/pages/xlwt/Workbook.py", line 643, in save
    doc.save(filename, self.get_biff_data())
  File "/Users/zach/Work/upload/pages/xlwt/Workbook.py", line 618, in get_biff_data
    shared_str_table   = self.__sst_rec()
  File "/Users/zach/Work/upload/pages/xlwt/Workbook.py", line 580, in __sst_rec
    return self.__sst.get_biff_record()
  File "/Users/zach/Work/upload/pages/xlwt/BIFFRecords.py", line 77, in get_biff_record
    self._add_to_sst(s)
  File "/Users/zach/Work/upload/pages/xlwt/BIFFRecords.py", line 92, in _add_to_sst
    u_str = upack2(s, self.encoding)
  File "/Users/zach/Work/upload/pages/xlwt/UnicodeUtils.py", line 50, in upack2
    us = unicode(s, encoding)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position 473: ordinal not in range(128)