skills/ HoangNguyen0403/agent-skills-standard

python-language

Core Python 3.11+ language standards for typing, dataclasses, imports, pathlib, and stdlib-first code. Use for idiomatic language constructs in Python modules or stubs; defer pytest fixtures, database/client configuration, subprocess security, and other specialized concerns.

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Python Language

Priority: P0 (CRITICAL)

Rules

  • Prefer from __future__ import annotations in modern modules.
  • Type public functions, return values, and boundary data shapes.
  • Use pathlib.Path, contextlib, enum, and stdlib helpers before custom wrappers.
  • Use @dataclass(frozen=True) for immutable contracts and value objects.
  • Prefer Protocol, TypedDict, or small dataclasses over dict[str, Any] sprawl.

Recipe

  1. Model contracts explicitly with dataclasses, typed dicts, or pydantic at I/O boundaries.
  2. Keep imports stable: stdlib, third-party, local.
  3. Use comprehensions and generators carefully; stop when readability drops.
  4. Choose explicit timezone-aware datetimes for persisted or user-visible timestamps.
  5. Keep module side effects minimal; import should not start work.

Anti-Patterns

  • No mutable defaults: use field(default_factory=...).
  • No os.path in new code: prefer Path.
  • No Any as escape hatch: narrow unknown shapes or validate them.
  • No import-time env reads for volatile runtime state unless cached config is intentional.

Verify

  • Run parser/type checks after cross-module type changes.
  • Load Framework Map for category defaults.

References

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