code: def _deprecate_python2():
      if sys.version_info[0] < 3:
          msg = (
              "Python2 has reached the end of its life on January 1st, 2020. "
              + "GluonCV has now dropped support for Python 2."
          )
          raise DeprecationWarning(msg)
  
label_desc: Use image node_id 3 for calling a global function with example usage: _deprecate_python2() without return types