ReddRadar
Agent skill
python3-stdlib-only
Python work in constrained, dependency-restricted, or legacy environments. Activates on "stdlib-only", "airgapped", "no dependencies", "no internet", "restricted environment", or confirmed Python 3.10 targets where third-party packages are prohibited.
Stars
33
Forks
4
Install this agent skill to your Project
npx add-skill https://github.com/Jamie-BitFlight/claude_skills/tree/main/plugins/python-engineering/skills/python3-stdlib-only
SKILL.md
Constrained / Legacy Environments
Consult python3-core for standing defaults.
This skill is for CONFIRMED constraints only. Do not assume restrictions. Verify with the user first.
mermaid
flowchart TD
Start([Need Python CLI script]) --> Q1{Environment allows network access?}
Q1 -->|Yes| UseTyper[Use python3-cli with Typer+Rich]
Q1 -->|No| Q2{Restriction type confirmed?}
Q2 -->|No| Stop[STOP — Verify with user first]
Q2 -->|Yes| StdLib[Use stdlib-only patterns]
Required Behavior
- Preserve compatibility before applying modernization patterns
- Prefer stdlib solutions when dependency policy is restrictive
- Choose typing features valid for the project floor
- Make boundary wrappers explicit when Pydantic is unavailable
- Avoid recommending tools or syntax that exceed the project lane
Stdlib CLI
python
import argparse
def create_parser() -> argparse.ArgumentParser:
parser = argparse.ArgumentParser(
description="Tool description",
formatter_class=argparse.RawDescriptionHelpFormatter,
)
return parser
Stdlib Logging
python
import logging
from pathlib import Path
def setup_logging(level: str = "INFO", log_file: Path | None = None) -> None:
handlers: list[logging.Handler] = [logging.StreamHandler()]
if log_file:
handlers.append(logging.FileHandler(log_file))
logging.basicConfig(
level=getattr(logging, level.upper(), logging.INFO),
format="%(asctime)s %(name)s %(levelname)s %(message)s",
handlers=handlers,
)
Stdlib Config
python
import json, tomllib
from pathlib import Path
def load_config(path: Path) -> dict[str, object]:
ext = path.suffix.lower()
if ext == ".json":
return json.loads(path.read_text())
if ext == ".toml":
return tomllib.loads(path.read_text())
raise ValueError(f"Unsupported config format: {ext}")
Shebang
Stdlib-only scripts use #!/usr/bin/env python3 (no PEP 723 metadata — nothing to declare).
References
references/command-execution.md,references/type-safety-patterns.md,references/typing-strategy.md— stdlib patterns and compatibility guidance
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