docstr: Token expiration sec requested when refreshing token 
docstr_tok: ["Token","expiration","sec","requested","when","refreshing","token"]
code: def req_token_expiration_sec(self):
      """Token expiration sec requested when refreshing token"""
      return self.__req_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 3 for calling the TokenManager obj's underlying member method code with example usage: obj.req_token_expiration_sec() and returns: self