Dev.to
7/19/2026

Building Your First AI Agent with Python: A Beginner's Guide
Short summary
A beginner tutorial walking through building a simple weather assistant AI agent in Python using OpenAI's function calling and the OpenWeatherMap API. The agent follows a standard loop: receive request, decide if a tool is needed, call the tool, and generate a response. The tutorial covers prerequisites, environment setup, building the weather tool, and letting the model decide when to invoke it.
- •Build a weather assistant agent in Python using OpenAI function calling
- •Covers the agent loop: request → tool decision → tool call → response
- •Beginner-friendly with prerequisites and step-by-step setup
Generated with AI, which can make mistakes.
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