Build Your Own AI Assistant: A Step-by-Step Tutorial with LangChain and GPT-4

By Theo Grant / June 25, 2026

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Build Your Own AI Assistant: A Step-by-Step Tutorial with LangChain and GPT-4

1. Setting Up Your Development Environment

Install Python 3.9+ and create a virtual environment to isolate dependencies.
Install required libraries: langchain, openai, python-dotenv.
Set up your OpenAI API key securely using environment variables (e.g., .env🤖 Editor's Pick Editor's Pick: AI coding notebook for beginners to prototype productivity tools using natural language commands. Browse on Amazon →

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