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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 search_continuous( self, continuous_set_id=None, reference_name="", start=0, end=0):
 """ Returns the result of running a search_continuous method on a request with the passed-in parameters. :param str continuous_set_id: ID of the ContinuousSet being searched :param str reference_name: name of the reference to search (ex: "chr1") :param int start: search start position on reference :param int end: end position on reference :return: an iterator over Continuous returned in the SearchContinuousResponse object. """

        request = protocol.SearchContinuousRequest()
        request.continuous_set_id = continuous_set_id
        request.reference_name = reference_name
        request.start = start
        request.end = end
        request.page_size = pb.int(self._page_size)
        return self._run_search_request(
            request, "continuous",
            protocol.SearchContinuousResponse)