How to handle API versioning in a Python 3.x CI/CD environment with FastAPI
I'm getting frustrated with I'm sure I'm missing something obvious here, but During development, I'm integrating multiple third-party APIs into our CI/CD pipeline using FastAPI. Each of these APIs has different versioning strategies, which complicates the integration process. Some APIs follow semantic versioning, while others utilize a simple version number in the endpoint. For instance, one API might expose endpoints like `/v1/users` and `/v2/users`, while another uses `/users/v1` and `/users/v2`. This inconsistency demands a careful approach to version management in my codebase. I’ve started defining routes in FastAPI based on the version, but I want to ensure that my implementation is clean and maintainable. Here’s a basic setup I have: ```python from fastapi import FastAPI app = FastAPI() @app.get("/v1/users") def get_users_v1(): return {"version": "v1", "users": []} @app.get("/v2/users") def get_users_v2(): return {"version": "v2", "users": []} ``` While this works, it feels repetitive, especially with potentially many more endpoints in the future. I've also considered using a prefix in the route that dynamically infers the version from the request. What strategies or design patterns can I employ to handle this more effectively? Additionally, I’m interested in how to best test these endpoints within the CI/CD process. Should I create dedicated test cases for each version of the API? How can I automate this in the pipeline to ensure we catch any breaking changes promptly? With these considerations in mind, any insights on best practices for handling API versioning in this context would be greatly appreciated, specifically around structuring the FastAPI routes and the associated testing strategies. I'm using Python 3.9 in this project. What's the best practice here? For context: I'm using Python on Windows 10. I appreciate any insights! This issue appeared after updating to Python 3.11.