ReddRadar
Agent skill
modernpython
Reference guide for Python 3.11+ patterns with PEP citations. Use when reviewing code for modernization opportunities, writing new code to ensure modern patterns, or learning about specific PEPs and features.
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33
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npx add-skill https://github.com/Jamie-BitFlight/claude_skills/tree/main/plugins/python-engineering/skills/modernpython
SKILL.md
Python Modernization Reference
Type Hints (PEP 585, 604)
python
# Legacy (NEVER)
from typing import List, Dict, Optional, Union
# Modern (ALWAYS)
items: list[str]
config: dict[str, int] | None
Walrus Operator (PEP 572)
python
if data := fetch_data():
process(data)
Match-Case (PEP 634)
python
match status_code:
case 200: return "OK"
case 404: return "Not Found"
case _: return "Unknown"
Self Type (PEP 673)
python
from typing import Self
class Builder:
def add(self, x: int) -> Self:
self.value += x
return self
Exception Notes (PEP 678)
python
except FileNotFoundError as e:
e.add_note(f"Attempted path: {path}")
raise
StrEnum (3.11+)
python
from enum import StrEnum
class Status(StrEnum):
PENDING = "pending"
RUNNING = "running"
Testing Patterns
python
from pytest_mock import MockerFixture
def test_feature(mocker: MockerFixture) -> None:
mock_func = mocker.patch('module.function', return_value=42)
CLI Patterns
python
from typing import Annotated
import typer
@app.command()
def process(
input_file: Annotated[Path, typer.Argument(help="Input file")],
verbose: Annotated[bool, typer.Option("--verbose", "-v")] = False,
) -> None:
"""Process input file."""
pass
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