code: def get_version(self):
          
          args = {"access_token": self.access_token}
          try:
              response = self.session.request(
                  "GET",
                  FACEBOOK_GRAPH_URL + self.version + "/me",
                  params=args,
                  timeout=self.timeout,
                  proxies=self.proxies,
              )
          except requests.HTTPError as e:
              response = json.loads(e.read())
              raise GraphAPIError(response)
  
          try:
              headers = response.headers
              version = headers["facebook-api-version"].replace("v", "")
              return str(version)
          except Exception:
              raise GraphAPIError("API version number not available")
docs: Fetches the current version number of the Graph API being used.