code: def encode_jwt(self, claims_set):
          
          token = jwt.encode(claims_set, self.private_key, self.algorithm)
  
          if PY3:
              token = token.decode(encoding='UTF-8')
  
          return token
docs: Encode a JWT token based on the claims_set and the settings.
  
          If available, registry.settings.jwtauth.private_key is used as key.
          In this case the algorithm must be an RS* or EC* algorithm.
          If registry.settings.jwtauth.private_key is not set,
          registry.settings.jwtauth.master_secret is used.
          registry.settings.jwtauth.algorithm is used as algorithm.
  
          :param claims_set: set of claims, which will be included in
              the created token.