python

# Python Development ## FastAPI Patterns - Pydantic models for all request/response - Dependency injection for services - Async/await for all I/O operations - Background tasks for heavy processing - Proper error handling with HTTPException ## Type Hints - Required for all function signatures - Use Optional[] for nullable params - Use Union[] for multiple types - Generic types for collections ## Data Processing - pandas for structured data - numpy for numerical operations - asyncio for concurrent I/O - ThreadPoolExecutor for CPU-bound tasks ## Audio (librosa) - BPM detection: librosa.beat.beat_track - Key detection: librosa.feature.chroma_cqt - Energy: librosa.feature.rms - Spectral features: centroid, bandwidth, rolloff ## Project Structure ``` project/ ├── app/ │ ├── main.py │ ├── models/ │ ├── services/ │ └── routes/ ├── tests/ ├── requirements.txt └── pyproject.toml ```