Build Your Own AI Chatbot: A Step-by-Step Tutorial with LangChain and OpenAI

1. Setting Up Your Development Environment

• Install Python and required libraries (openai, langchain, streamlit) using pip.
• Set up a virtual environment and securely store your OpenAI API key as an environment variable.
• Verify the installation by running a simple test script that calls the OpenAI API.

2. Understanding the Core Components of a Chatbot

• Learn how LangChain structures chains, prompts, and conversation memory for context-aware replies.
• Explore the OpenAI API: choose between GPT‑3.5‑turbo and GPT‑4 based on cost and performance needs.
• Understand how conversation memory (e.g., `ConversationBufferMemory`) retains chat history across turns.

3. Writing the Chatbot Backend Logic

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