python-scala-sealed-enum SKILL.md skillA
python-scala-sealed-enum from cxcscmu/skilllearnbench is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add cxcscmu/skilllearnbench/python-scala-sealed-enum@git:20260424.d50cf5aPins git:20260424.d50cf5a in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- cxcscmu/skilllearnbench
- Path
skills/b1-one-shot-claude-sonnet-4-6/python-scala-translation/python-scala-sealed-enum/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260424.d50cf5a, committed Apr 24, 2026
- Size
- 1,966 bytes
- Repository stars
- 91
- License
- MIT
Translating Python Enum classes to Scala sealed abstract classes or sealed traits with companion objects, preserving value fields and exhaustive pattern matching.
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 Enum → Scala Sealed Traits
## Python Pattern
```python
class TokenType(Enum):
STRING = "string"
NUMERIC = "numeric"
NULL = "null"
```
## Scala Idiomatic Translation
Use `sealed abstract class` (not `Enum`) with a companion `object` holding `case object` members:
```scala
sealed abstract class TokenType(val value: String)
object TokenType {
case object STRING extends TokenType("string")
case object NUMERIC extends TokenType("numeric")
case object NULL extends TokenType("null")
}
```
**Why `sealed abstract class` over `sealed trait`?**
- Use `sealed abstract class` when members need constructor parameters (like `value: String`).
- Use `sealed trait` for purely marker/tag types with no data.
## Key Differences from Python
| Python | Scala |
|--------|-------|
| `TokenType.STRING.value` | `TokenType.STRING.value` (same API) |
| `isinstance(x, TokenType)` | Pattern match on sealed type |
| Can iterate `list(TokenType)` | Use `Set(STRING, NUMERIC, ...)` manually |
| `TokenType["STRING"]` | Not needed; use `TokenType.STRING` directly |
## Exhaustive Pattern Matching (Bonus)
```scala
def describe(t: TokenType): String = t match {
…Read the whole file at its exact version.
How to install
mdr add cxcscmu/skilllearnbench/python-scala-sealed-enum@sha256:6d9c0e5697d460f4The line at the top of this page pins the label git:20260424.d50cf5a, 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_z5td7326e2a5l75h)
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Versions
The registry has recorded 1 version of this file, committed on Apr 24, 2026.
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Source
cxcscmu/skilllearnbench · 91 stars · license MIT · pushed 2026-10-02 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_z5td7326e2a5l75h GET https://markdownregistry.com/api/v1/resolve?ref=cxcscmu/skilllearnbench/python-scala-sealed-enum GET https://markdownregistry.com/api/v1/blob/6d9c0e5697d460f41e89a35576b30b13e15bba353f66c41c7a1b8d9d1a21ccdf
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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.