Your tests pass… only if they run last? Global configs haunting you? Django models moonlighting as email bots?
It’s not Python’s fault. The real culprit? Mixing all layers into one messy soup — data, business logic, integrations, and side effects in a single blob.
In 2025, architecture is everything:
✅ Separate data and business logic.
✅ Break up that “mega” utils.py.
✅ Kill global state before it kills your tests.
💡 Clear layers mean faster tests, smoother scaling, and fewer late-night pagers.
👉 See concrete patterns, fixes, and a checklist you can copy today in the full story.
https://medium.com/pythoneers/why-90-of-python-projects-in-2025-stumble-over-a-single-architectural-choice-3f73f548ef6e
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