Depending on whether you interface with the cli or the witness node you may also need to take a llook this script: https://github.com/xeroc/python-graphenelib/blob/master/scripts/monitor-deposits/monitor.py#L28

This interfaces with the witness node but requires to subscribe to the history-api

Looks like you're using the wrong API - you need to connect to the CLI wallet to get account history. Either that or you haven't requested the history API from the cli wallet:

Take a look here: https://github.com/xeroc/python-graphenelib/blob/master/grapheneapi/graphenewsprotocol.py

self.wsexec([1,"history",[]], [
                             partial(self._set_api_id, "history"),
                            ])

Our technical have met following problem when trying to call get_account_history by RPC.
Here is the detail.
Please help, thanks