I write little script run python via netcat http://www2s.biglobe.ne.jp/~niitsuma/jsonrpcdirect.html
Usage
$ netcat localhost 31415
{"method": "numpy.linalg.norm", "params": [[2,2]], "id": 0}
then get response
{"result": 2.8284271247461903, "error": null, "id": 0}
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