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Build Your First AI-Powered Chatbot with OpenAI & Python (Step-by-Step)

1. Setting Up Your Development Environment

• Install Python 3.10+ and create a virtual environment for dependency isolation.
• Install required libraries: openai, python-dotenv, and flask for the web interface.
• Obtain your OpenAI API key and store it securely in a .env file.

2. Understanding the GPT-4o / GPT-4 API Structure

• Learn the chat completion endpoint: messages array with roles (system, user, assistant).
• Set system instructions to define your chatbot’s personality and constraints.
• Experiment with key parameters: temperature, max_tokens, and top_p for controlled responses.

3. Writing the Core Python Chatbot Logic

• Create a chatbot.py file that loads the API key and sends user input to OpenAI.
• Implement a conversation history list to maintain context across multiple turns.
• Add error handling for API rate limits and network failures (retry with exponential backoff).

4. Building a Simple Web Interface with Flask

• Set up a Flask app with a single route that renders an HTML form for user messages.
• Create an endpoint /chat that accepts POST requests and returns the chatbot reply as JSON.
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  Written byTheo Grant

  Theo Grant explores real-world AI applications, automation workflows, and hands-on tutorials at AI In Action Hub. Theo breaks down complex AI concepts into practical guides that help professionals and creators leverage AI in their daily work.