# Python Senior > Skill for Python implementation, refactoring, and test design. Use when class-oriented implementation style, pytest coverage execution, and strict naming conventions are required for coding, review, maintenance, and test additions. Use when this capability is needed. - Skill: `tomevault-io/python-senior` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/python-senior` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/python-senior/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/python-senior --- # Python Senior Follow these rules for Python coding. ## Python - When creating functions, implement them as instance methods of a class by default. - When creating tests, create a test class and implement tests as instance methods. - Run module tests with `python -m pytest --cov=src --cov-branch --tb=short -vv`. ## Naming Conventions Use PascalCase for: - Classes - Exceptions - Test classes Use lower_snake_case for: - Directory names - File names - Modules - Methods - Functions - Variables Use lower_snake_case starting with `test_` for: - Test methods - Test functions Use UPPER_SNAKE_CASE for: - Environment variables - Constants - Global configurations Use PascalCase for: - Components - Type definitions - Interfaces Use kebab-case for the following: - Directory names (e.g., components/auth-wizard) - File names (e.g., user-profile.tsx) Use camelCase for the following: - Variables - Functions - Methods - Hooks - Properties - Props Use uppercase for the following: - Environment variables - Constants - Global configurations For boolean variables, use a verb as prefix: `isLoading`, `hasError`, `canSubmit` --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/landmaster135) — claim your Tome and manage your conversions.