python

name	python
description	Python development with FastAPI, data processing, audio analysis with librosa. Type hints, async patterns, Pydantic models. Don't use for JavaScript/TypeScript code.
model	sonnet
effort	medium
allowed-tools	Read, Write, Edit, Bash, Grep, Glob
paths	**/*.py,**/requirements.txt,**/pyproject.toml

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