>>> import modbus_tk
>>> help(modbus_tk)
Help on package modbus_tk:

NAME
    modbus_tk - Modbus TestKit: Implementation of Modbus protocol in python

DESCRIPTION
     (C)2009 - Luc Jean - luc.jean@gmail.com
     (C)2009 - Apidev - http://www.apidev.fr

     This is distributed under GNU LGPL license, see license.txt

     Make possible to write modbus TCP and RTU master and slave for testing purpose
     Modbus TestKit is different from pymodbus which is another implementation of
     the modbus stack in python

    contributors:
    ----------------------------------
    * OrangeTux
    * denisstogl
    * MELabs
    * idahogray
    * riaan.doorduin
    * tor.sjowall
    * smachin1000
    * GadgetSteve
    * dhoomakethu
    * zerox1212
    * ffreckle
    * Matthew West
    * Vincent Prince
    * kcl93
    * https://github.com/Slasktra
    * travijuu
    * Jackson Matheson
    Please let us know if your name is missing!

PACKAGE CONTENTS
    defines
    exceptions
    hooks
    modbus
    modbus_rtu
    modbus_rtu_over_tcp
    modbus_tcp
    simulator
    simulator_rpc_client
    utils

DATA
    LOGGER = <Logger modbus_tk (WARNING)>
    VERSION = ‘1.1.1‘