I use bitcoind -daemon -datadir=/mydata/btc/storage -rpcport=1234 to start BTC wallet.
and use code: as follows (python)
import requests params={"method": "GetBestBlockHash","params": [],"id": "foo"} url="http://127.0.0.1:1234" print(requests.post(url=url,json=params).text)
but no return