python-scala-oop SKILL.md skillA
python-scala-oop 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-oop@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-opus-4-6/python-scala-translation/python-scala-oop/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260424.d50cf5a, committed Apr 24, 2026
- Size
- 1,619 bytes
- Repository stars
- 91
- License
- MIT
Guide for translating Python classes, inheritance, ABC, generics and builder patterns to idiomatic Scala.
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 to Scala OOP Patterns
## Abstract Base Class -> Abstract Class or Trait
```scala
// Python: class BaseTokenizer(ABC, Generic[T])
// Scala:
abstract class BaseTokenizer[T] {
def tokenize(value: T): Token
def tokenizeBatch(values: Iterable[T]): Iterator[Token] =
values.iterator.map(tokenize)
}
```
## Generic Classes with Variance
```scala
// Covariant container (produces T)
class TokenContainer[+T](items: Seq[T]) {
private val _items: Vector[T] = items.toVector
def getAll: Vector[T] = _items
}
// Contravariant sink (consumes T)
class TokenSink[-T] { ... }
// Invariant handler
class BivariantHandler[T](private var _value: T) { ... }
```
## Builder Pattern (Fluent Interface)
```scala
// Use `this.type` or return the class itself for chaining
class TokenizerBuilder[T] {
def withNormalizer(f: String => String): TokenizerBuilder[T] = { ... ; this }
def build(): T => Token = { ... }
}
// Companion object with apply for factory
object TokenizerBuilder {
def apply[T](): TokenizerBuilder[T] = new TokenizerBuilder[T]
}
```
## Mutable State
```scala
// Python: @dataclass with mutable fields
// Scala: use var or mutable collections explicitly
…Read the whole file at its exact version.
How to install
mdr add cxcscmu/skilllearnbench/python-scala-oop@sha256:344813b6d483a776The 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_urh7nfxbdlbf3uz2)
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Versions
The registry has recorded 1 version of this file, committed on Apr 24, 2026.
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 (1619 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
cxcscmu/skilllearnbench · 91 stars · license MIT · pushed 2026-10-02 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_urh7nfxbdlbf3uz2 GET https://markdownregistry.com/api/v1/resolve?ref=cxcscmu/skilllearnbench/python-scala-oop GET https://markdownregistry.com/api/v1/blob/344813b6d483a776d95bec67ec18c9af7ed1d68c8f6b2cb6db2a4b498bdb7406
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.