class_docstr: Class to wrap Langchain LLMs and make PandasAI interoperable
  with LangChain.
code: def __init__(self, langchain_llm):
      self._langchain_llm = langchain_llm
  
imports: from pandasai.prompts.base import AbstractPrompt
  from .base import LLM
label_desc: Use image node_id 1 to create a new LangchainLLM object from inherited base classes: LLM with example: obj = LangchainLLM(langchain_llm)