code: def get_token_valid_period_sec(self):
      return self._calc_token_valid_period_sec(
          self.__token, self.token_expiration_sec
      )
  
imports: import sys
  from abc import ABCMeta, abstractmethod
  from time import time
  import jwt
  from jwt.algorithms import get_default_algorithms
  import six
label_desc: Use image node_id 13 for calling the TokenManager obj's underlying member method code with example usage: obj.get_token_valid_period_sec() and returns: self