input: Write a function to implement a Python API for KB SRU. The function should create an instance of the "sru" class and call its "search" method, passing in a query string and optionally a collection name, start record number, maximum number of records to return, and record schema. The method will return a "response" object containing the results of the search. You can then use the various properties of the "response" object to extract specific information from the search results, such as titles, creators, and subjects.
  assert sru_search("test query", "ANP") is not None
  assert sru_search("test query", "ANP").titles == []
  assert sru_search("test query", "GGC").creators == []
  assert sru_search("test query", "BYVANCK") is not None
output: def sru_search(query, collection_name=None, start_record=None, max_records=None, record_schema=None):
      sru_instance = sru()
      response = sru_instance.search(query, collection_name, start_record, max_records, record_schema)
      return response