Call Python function from Erlang Code

Question

I am working on MQTT broker (http://www.emqtt.io), which is written in Erlang. I have a use case where I need to call one of my python module from emqtt broker code written in erlang.

I have already checked into the google about erlport (http://erlport.org/) which is use for port communication between erlang and python. It works well in erlang shell but when I use the same in emqtt erlang code then it does not work. It throws an error shown below

17:22:40.073 <0.717.0> [error] gen_server <0.717.0> terminated with reason: call to undefined function python:start()
17:22:40.073 <0.717.0> [error] CRASH REPORT Process <0.717.0> with 1 neighbours exited with reason: call to undefined function python:start() in gen_server2:terminate/3 line 1151
17:22:40.073 <0.631.0> [error] Supervisor emqttd_session_sup had child session started with {emqttd_session,start_link,undefined} at <0.717.0> exit with reason call to undefined function python:start() in context child_terminated
17:22:40.073 <0.677.0> [error] Supervisor 'esockd_connection_sup - <0.677.0>' had child connection started with emqttd_client:start_link([{packet,[{max_clientid_len,512},{max_packet_size,65536}]},{client,[{idle_timeout,30}]},{session,...},...]) at <0.716.0> exit with reason call to undefined function python:start() in context connection_crashed

We are calling python module from emqtt plugins code, change of code is show below

on_message_acked(ClientId, Message, _Env) ->
   io:format("client ~s acked: ~s~n", [ClientId, emqttd_message:format(Message)]),
   io:format("client ~s",[python:start()]),
   {ok, Message}.

Please help us.