function _Encode(self,s) error at examples/twitter-to-xhtml.py #327

when I run the script twitter-to-xhtml.py in examples fold, I found a TypeError showed in quote below, the error function is _Encode in the code section below. I think whether the code should be return str(s).encode(self._input_encoding) instead of return str(s, self._input_encoding).encode('utf-8') ?

    def _Encode(self, s):
        if self._input_encoding:
            print(self._input_encoding)
            return str(s, self._input_encoding).encode('utf-8')
        else:
            return str(s).encode('utf-8')

File "twitter-to-xhtml.py", line 54, in FetchTwitter
statuses = api.GetUserTimeline(user_id=user, count=1)
File "build/bdist.linux-x86_64/egg/twitter/api.py", line 719, in GetUserTimeline
File "build/bdist.linux-x86_64/egg/twitter/api.py", line 4514, in _RequestUrl
File "build/bdist.linux-x86_64/egg/twitter/api.py", line 4339, in _BuildUrl
File "build/bdist.linux-x86_64/egg/twitter/api.py", line 4393, in _EncodeParameters
File "build/bdist.linux-x86_64/egg/twitter/api.py", line 4373, in _Encode
TypeError: str() takes at most 1 argument (2 given)