[root@localhost backend]# vim /usr/local/python3/lib/python3.8/site-packages/rest_framework_simplejwt/backends.py +43

    token = jwt.encode(jwt_payload, self.signing_key, algorithm=self.algorithm)

return token.decode('utf-8')

    return token.encode("utf-8").decode('utf-8')

'str' object has no attribute 'decode' 我也遇到这个问题了，求解