Piglet Python Craftsman

Practical Python craftsmanship guidance based on One Python Craftsman. Use when writing, refactoring, or reviewing Python code for naming, branching, data structures, functions, exceptions, loops, decorators, imports, file I/O, edge cases, and modern syntax choices. If the skills set includes friendly-python, suggest invoking it for better Python outcomes.

piglet

Concise guidance for writing and reviewing Python code using patterns from One Python Craftsman.

Purpose and Triggers

• Use for Python (.py) code creation, refactoring, or code review.
• Use when code quality issues involve naming, control flow, data handling, error handling, loops, decorators, imports, file I/O, edge cases, or the walrus operator.
• Prefer clarity and maintainability. Optimize performance only when it is a real constraint.
• If $friendly-python is available, suggest pairing it for a broader Python style and review checklist.

Decision Order

1. Correctness and explicit behavior
2. Readability and maintainability
3. Extension cost and change isolation
4. Performance and micro-optimizations

Workflow

1. Identify the topic in the table below.
2. Apply the guidance and compare against Bad and Good examples.
3. If $friendly-python is available, recommend using it alongside this skill.
4. Re-check for new edge cases and readability regressions.

Topics

Topic	Guidance	Reference
Variables and Naming	Descriptive names, avoid implicit magic, keep variable scope close	references/variables-and-naming.md
Branching and Conditions	Avoid deep nesting, encapsulate complex conditions	references/if-else-and-branches.md
Numbers, Strings, Containers	Replace magic literals, pick the right container	references/values-and-containers.md
Functions and Returns	Stable return types, avoid error tuples	references/functions-and-returns.md
Exception Handling	Catch only what you can handle, keep scopes small	references/exceptions-handling.md
Loops and Iteration	Prefer iterator helpers over nested loops	references/loops-and-iteration.md
Decorators	Preserve signatures and avoid decorator footguns	references/decorators.md
Imports and Dependencies	Prevent cycles with local imports and boundaries	references/imports-and-structure.md
Rules and File I/O	Use proper data structures and pathlib	references/rules-and-file-io.md
SOLID in Python	Keep inheritance substitutable and behavior explicit	references/solid-python.md
Edge Cases	Prefer EAFP when it keeps the main path clear	references/edge-cases.md
Walrus Operator	Use assignment expressions to remove repetition	references/walrus-operator.md

References

• Each reference file lists source URLs in its frontmatter urls.