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Building Your First AI Chatbot: A Step-by-Step Tutorial Using Python and OpenAI

1. Setting Up Your Development Environment

• Install Python 3.8+ and verify with python --version.
• Create a virtual environment to isolate dependencies: python -m venv chatbot-env.
• Choose a code editor (VS Code recommended) and open your project folder.

2. Getting Your OpenAI API Key

• Sign up at platform.openai.com and log in to your account.
• Navigate to API keys section and create a new secret key; copy it immediately.
• Store the key securely as an environment variable (e.g., OPENAI_API_KEY).

3. Installing Required Libraries

• Install the OpenAI Python package: pip install openai.
• Install python-dotenv to load environment variables: pip install python-dotenv.
• Optionally install gradio for a simple web interface: pip install gradio.

4. Writing the Core Chatbot Code

• Create a chatbot.py file and import openai, os, and dotenv.
• Load the API key from the environment and set up the OpenAI client.
• Write a function that sends a user message to the GPT model and returns the assistant’s reply.

5. Adding Context and Memory

• Maintain a conversation history list of messages (role: user/assistant).
• Pass the full history with each API call to keep context across turns.
• Implement a token limit check to avoid exceeding the model’s context window
  

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