python-best-practices SKILL.md skillA
python-best-practices from aiskillstore/marketplace is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add aiskillstore/marketplace/python-best-practices@git:20260705.e9e4712Pins git:20260705.e9e4712 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- aiskillstore/marketplace
- Path
skills/0xbigboss/python-best-practices/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260705.e9e4712, committed Jul 5, 2026
- First version recorded
- Jan 13, 2026
- Size
- 2,924 bytes
- Repository stars
- 471
- License
- none declared
Use when reading or writing Python files (.py, pyproject.toml, requirements.txt).
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Python Best Practices
Follows type-first, functional, and error handling patterns from CLAUDE.md. This skill covers language-specific idioms only.
## Make Illegal States Unrepresentable
Use Python's type system to prevent invalid states at type-check time.
**Frozen dataclasses for immutable domain models:**
```python
from dataclasses import dataclass
from datetime import datetime
@dataclass(frozen=True)
class User:
id: str
email: str
name: str
created_at: datetime
# Frozen dataclasses are immutable — no accidental mutation
```
**Discriminated unions with Literal:**
```python
from dataclasses import dataclass
from typing import Literal
@dataclass
class Success:
status: Literal["success"] = "success"
data: str
@dataclass
class Failure:
status: Literal["error"] = "error"
error: Exception
RequestState = Success | Failure
def handle_state(state: RequestState) -> None:
match state:
case Success(data=data):
render(data)
case Failure(error=err):
show_error(err)
```
**NewType for domain primitives:**
```python
from typing import NewType
UserId = NewType("UserId", str)
…Read the whole file at its exact version.
How to install
mdr add aiskillstore/marketplace/python-best-practices@sha256:be327c181e4ad7beThe line at the top of this page pins the label git:20260705.e9e4712, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_47yr243zkkqv5w5e)
6 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Jan 13, 2026 and Jul 5, 2026, about one every 173 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260705.e9e4712 latest | 2026-07-05 | e9e4712 | 2,924 B | A | view · diff |
| git:20260113.222b7de | 2026-01-13 | 222b7de | 7,668 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (2924 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
aiskillstore/marketplace · 471 stars · license none declared · pushed 2026-11-08 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_47yr243zkkqv5w5e GET https://markdownregistry.com/api/v1/resolve?ref=aiskillstore/marketplace/python-best-practices GET https://markdownregistry.com/api/v1/blob/be327c181e4ad7befed3670b33c94f5a5dcf80f8b873f1a6ad24fdc80b36b6ac
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
More from aiskillstore/marketplace
Every file in aiskillstore/marketplace