def _AddAuthorizationHeader(self, username, password):
    if username and password:
      basic_auth = base64.encodestring((username, password) % '%s:%s')[:-1]
      self._request_headers['Authorization'] = 'Basic %s' % basic_auth
dataset/ETHPy150Open CollabQ/CollabQ/vendor/twitterapi/twitter.py/Api._AddAuthorizationHeader/swapped operands of `%`