Write and validate Python 3.12+ type hints with PEP 695 and TypedDict.
npx skills add https://github.com/amaozhao/MySkills --skill python-type-hints
Please help me install this Agent Skill. Skill: python-type-hints Source: https://github.com/amaozhao/MySkills/tree/main/skills/python-type-hints Command: npx skills add https://github.com/amaozhao/MySkills --skill python-type-hints
Writing Python code with clear, strong type hints reduces runtime errors and improves maintainability, especially when leveraging Python 3.12+ features like PEP 695 type parameters, TypedDict with Required/NotRequired/ReadOnly, Final, Self, and LiteralString.
Create a small Python snippet that demonstrates a function using a union type, a TypedDict with a required field and an optional field, and a class method using Self. Run a type checker (e.g., mypy or Pyright) to observe type validations.
High-intent search queries and answers about installing and using this skill.
Python 3.12 type hints using PEP 695 type parameters allow defining generics inline. This skill guides you in writing modern syntax with type aliases via the type keyword to improve type safety in new projects or library APIs.
TypedDict enhancements provide precise input shapes for Python dictionaries. You can mark specific fields as Required or NotRequired, ensuring type checkers validate both mandatory and optional keys accurately during code refactoring.
LiteralString restricts risky or dynamic SQL text in Python. By applying this type hint, you prevent SQL injection vulnerabilities by ensuring type checkers enforce only statically known string values are passed to database queries.
The Self type hint supports fluent APIs and safe recursive patterns in Python classes. It accurately annotates methods that return an instance of the current class, ensuring type checkers correctly validate method chaining and inheritance.
Yes, this approach works for gradually typing existing code. You can incrementally introduce strong typing using modern constructs like Final constants and union types with the pipe operator to reduce runtime errors without a full rewrite.
ReadOnly with TypedDict prevents modification of dictionary values after creation. While it improves maintainability and type safety, it requires a modern Python 3.12+ environment and compatible type checkers like Pyright to enforce these immutability constraints.
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