python-scala-collections

name	python-scala-collections
description	Guide for mapping Python collection types and operations to Scala equivalents.

Python to Scala Collections

Type Mappings

Python	Scala
list[T]	List[T] or mutable.ListBuffer[T]
dict[K, V]	Map[K, V] or mutable.Map[K, V]
tuple[T, ...]	(T, ...) or Vector[T]
set[T]	Set[T]
Sequence[T]	Seq[T]
Iterable[T]	Iterable[T]
Iterator[T]	Iterator[T]

Mutable Collections

import scala.collection.mutable

// Python: list with append -> mutable.ListBuffer
val buf = mutable.ListBuffer.empty[Token]
buf += token

// Python: dict -> mutable.Map
val reg = mutable.Map.empty[String, TokenContainer[T]]
reg(key) = container

Collection Operations

// Python: [f(x) for x in xs] -> xs.map(f)
// Python: [x for x in xs if p(x)] -> xs.filter(p)
// Python: enumerate(xs) -> xs.zipWithIndex