code: def set_api_version(self, version):
      self.__verify_version_exists(version)
      self.api_version = version
      self.__headers["x-readme-version"] = "v" + version
      if "categories" not in self.get_version():
          self.__refresh_categories()
  
imports: import json
  import os
  from requests.auth import HTTPBasicAuth
  import requests
label_desc: Use image node_id 2 for calling the ReadMeSession obj's underlying member method code with example usage: obj.set_api_version(version) without return types