Traceback (most recent call last):
  File "/usr/bin/2to3", line 5, in <module>
    sys.exit(main("lib2to3.fixes"))
  File "/usr/lib/python2.7/lib2to3/main.py", line 173, in main
    options.processes)
  File "/usr/lib/python2.7/lib2to3/refactor.py", line 700, in refactor
    items, write, doctests_only)
  File "/usr/lib/python2.7/lib2to3/refactor.py", line 294, in refactor
    self.refactor_dir(dir_or_file, write, doctests_only)
  File "/usr/lib/python2.7/lib2to3/refactor.py", line 314, in refactor_dir
    self.refactor_file(fullname, write, doctests_only)
  File "/usr/lib/python2.7/lib2to3/refactor.py", line 741, in refactor_file
    *args, **kwargs)
  File "/usr/lib/python2.7/lib2to3/refactor.py", line 336, in refactor_file
    input, encoding = self._read_python_source(filename)
  File "/usr/lib/python2.7/lib2to3/refactor.py", line 332, in _read_python_source
    return _from_system_newlines(f.read()), encoding
  File "/usr/lib/python2.7/codecs.py", line 671, in read
    return self.reader.read(size)
  File "/usr/lib/python2.7/codecs.py", line 477, in read
    newchars, decodedbytes = self.decode(data, self.errors)
UnicodeDecodeError: 'utf8' codec can't decode byte 0xf6 in position 22890: invalid start byte