Alternative for rpc_connection.batch_(commands) method

Alternative for rpc_connection.batch_(commands) method

I want some alternative method for rpc_connection.batch_(commands) to get the bitcoin blocks and transactions data. I have below code in python3 but I want to use different method.

commands = [ [ "getblockhash", height] for height in range(rangestart,rangeend) ]
block_hashes = rpc_connection.batch_(commands)

Can somebody help with this question? I also want some bitcoind rpc documentation links.

http://bit.ly/2Rer7dt

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