python-patternslisted

# Python Patterns > Python development principles and decision-making for 2025. > **Learn to THINK, not memorize patterns.** --- ## ⚠️ How to Use This Skill This skill teaches **decision-making principles**, not fixed code to copy. - ASK user for framework preference when unclear - Choose async vs sync based on CONTEXT - Don't default to same framework every time --- ## 1. Framework Selection (2025) ### Decision Tree ``` What are you building? │ ├── API-first / Microservices │ └── FastAPI (async, modern, fast) │ ├── Full-stack web / CMS / Admin │ └── Django (batteries-included) │ ├── Simple / Script / Learning │ └── Flask (minimal, flexible) │ ├── AI/ML API serving │ └── FastAPI (Pydantic, async, uvicorn) │ └── Background workers └── Celery + any framework ``` ### Comparison Principles | Factor | FastAPI | Django | Flask | |--------|---------|--------|-------| | **Best for** | APIs, microservices | Full-stack, CMS | Simple, learning | | **Async** | Native | Django 5.0+ | Via extensions | | **Admin** | Manual | Built-in | Via extensions | | **ORM** | Choose your own | Django ORM | Choose your own | | **Learning curve** | Low | Medium | Low | ### Selection Questions to Ask: 1. Is this API-only or full-stack? 2. Need admin interface? 3. Team familiar with async? 4. Existing infrastructure? --- ## 2. Async vs Sync Decision ### When to Use Async ``` async def is better when: ├── I/O-bound operations (database, HTTP, file) ├── Many concurrent connections