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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _wrap_class(request_handler, validator):
 """Decorate each HTTP verb method to check if the request is authenticated :param request_handler: a tornado.web.RequestHandler instance """

    METHODS = ['get', 'post', 'put', 'head', 'options', 'delete', 'patch']
    for name in METHODS:
        method = getattr(request_handler, name)
        setattr(request_handler, name, _auth_required(method, validator))

    return request_handler