code: #!/usr/bin/env python3
  
  from restapi_helper import LangChainHelper
  from langchain.schema import HumanMessage
  
  print('==Simple message predict==')
  with LangChainHelper() as lch:
      text = 'Hey there!'
      messages = [HumanMessage(content=text)]
      print(lch.predict_messages(messages))
  
  print('==As English teacher - know the answer==')
  with LangChainHelper() as lch:
      role = 'English teacher'
      text = 'What is a plural form of child?'
      print(lch.get_answer_as_role(role, text))
  
  print('==As English teacher - does not know the answer==')
  with LangChainHelper() as lch:
      role = 'English teacher'
      text = 'How old am I?'
      print(lch.get_answer_as_role(role, text))
  
apis: langchain.schema.HumanMessage
extract_api: [((157, 174), 'restapi_helper.LangChainHelper', 'LangChainHelper', ([], {}), '()\n', (172, 174), False, 'from restapi_helper import LangChainHelper\n'), ((355, 372), 'restapi_helper.LangChainHelper', 'LangChainHelper', ([], {}), '()\n', (370, 372), False, 'from restapi_helper import LangChainHelper\n'), ((572, 589), 'restapi_helper.LangChainHelper', 'LangChainHelper', ([], {}), '()\n', (587, 589), False, 'from restapi_helper import LangChainHelper\n'), ((225, 251), 'langchain.schema.HumanMessage', 'HumanMessage', ([], {'content': 'text'}), '(content=text)\n', (237, 251), False, 'from langchain.schema import HumanMessage\n')]