def _type_check(arg, msg):
 if (arg is None):
  return type(None)
 if isinstance(arg, basestring):
  arg = _ForwardRef(arg)
 if ((isinstance(arg, _TypingBase) and (type(arg).__name__ == u'_ClassVar')) or ((not isinstance(arg, (type, _TypingBase))) and (not callable(arg)))):
  raise TypeError((msg + (u' Got %.100r.' % (arg,))))
 if (((type(arg).__name__ in (u'_Union', u'_Optional')) and (not getattr(arg, u'__origin__', None))) or (isinstance(arg, TypingMeta) and (_gorg(arg) in (Generic, _Protocol)))):
  raise TypeError((u'Plain %s is not valid as type argument' % arg))
 return arg

def _type_check ( arg , msg ) : if ( arg is None ) : return type ( None ) if isinstance ( arg , basestring ) : arg = _ForwardRef ( arg ) if ( ( isinstance ( arg , _TypingBase ) and ( type ( arg ) . __name__ == u'_ClassVar' ) ) or ( ( not isinstance ( arg , ( type , _TypingBase ) ) ) and ( not callable ( arg ) ) ) ) : raise TypeError ( ( msg + ( u' Got %.100r.' % ( arg , ) ) ) ) if ( ( ( type ( arg ) . __name__ in ( u'_Union' , u'_Optional' ) ) and ( not getattr ( arg , u'__origin__' , None ) ) ) or ( isinstance ( arg , TypingMeta ) and ( _gorg ( arg ) in ( Generic , _Protocol ) ) ) ) : raise TypeError ( ( u'Plain %s is not valid as type argument' % arg ) ) return arg
check that the argument is a type .