code: def login(self, username, password):
          '''Authenticate using XAuth variant of OAuth.
  
          :param str username: Username or email address for the relevant account
          :param str password: Password for the account
          '''
          response = self.request(
              ACCESS_TOKEN,
              {
                  'x_auth_mode': 'client_auth',
                  'x_auth_username': username,
                  'x_auth_password': password
              },
              returns_json=False
          )
          token = dict(parse_qsl(response['data'].decode()))
          self.token = oauth.Token(
              token['oauth_token'], token['oauth_token_secret'])
          self.oauth_client = oauth.Client(self.consumer, self.tokenf login(self, username, password):
          '''Authenticate using XAuth variant of OAuth.
  
          :param str username: Username or email address for the relevant account
          :param str password: Password for the account
          '''
          response = self.request(
              ACCESS_TOKEN,
              {
                  'x_auth_mode': 'client_auth',
                  'x_auth_username': username,
                  'x_auth_password': password
              },
              returns_json=False
          )
          token = dict(parse_qsl(response['data'].decode()))
          self.token = oauth.Token(
              token['oauth_token'], token['oauth_token_secret'])
          self.oauth_client = oauth.Client(self.consumer, self.token)
docs: Authenticate using XAuth variant of OAuth.
  
          :param str username: Username or email address for the relevant account
          :param str password: Password for the account