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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 add_global_request_interceptor(self, request_interceptor):
 # type: (AbstractRequestInterceptor) -> None """Register input to the global request interceptors list. :param request_interceptor: Request Interceptor instance to be registered. :type request_interceptor: AbstractRequestInterceptor :return: None """

        if request_interceptor is None:
            raise RuntimeConfigException(
                "Valid Request Interceptor instance to be provided")

        if not isinstance(request_interceptor, AbstractRequestInterceptor):
            raise RuntimeConfigException(
                "Input should be a RequestInterceptor instance")

        self.global_request_interceptors.append(request_interceptor)