code: def _get_user_agent():
          
          # __name__ returns all classes, we only want the client
          client = "{0}/{1}".format(__name__.split(".")[0], ver.__version__)
          python_version = "Python/{v.major}.{v.minor}.{v.micro}".format(
              v=sys.version_info
          )
          system_info = "{0}/{1}".format(platform.system(), platform.release())
          user_agent_string = " ".join([python_version, client, system_info])
          return user_agent_string
docs: Construct the user-agent header with the package info,
          Python version and OS version.
  
          Returns:
              The user agent string.
              e.g. 'Python/3.6.7 slack/2.0.0 Darwin/17.7.0'