from langchain_google_genai import ChatGoogleGenerativeAI from dotenv import load_dotenv import os load_dotenv() api_key=os.getenv("GOOGLE_API_KEY") model="gemini-2.5-flash" def hello_langchain(prompt, history): llm = ChatGoogleGenerativeAI(api_key=api_key, model=model) response = llm.invoke(prompt) return response.content if __name__=="__main__": print(hello_langchain("Hello"))