Python scala syntax mapping

Python to Scala Syntax Mapping

This skill provides a quick reference for translating basic Python syntax to Scala 2.13.

Type Mapping

Python	Scala	Notes
int	Int or Long	Use Long for large integers.
float	Double	Scala's Double is equivalent to Python's float.
str	String
bytes	Array[Byte]
bool	Boolean
None	null or None	Use Option[T] (Some/None) for idiomatic Scala.
list[T]	List[T] or Seq[T]	List is immutable, ArrayBuffer is mutable.
dict[K, V]	Map[K, V]	Map is immutable, mutable.Map is mutable.
tuple[T, ...]	(T, ...)	Scala uses parentheses for tuples.
Any	Any
Union[A, B]	Either[A, B] or Trait	Use traits for better structure.

Variables and Constants

• Python: x = 1 (mutable/immutable by convention)
• Scala: val x = 1 (immutable), var x = 1 (mutable)

String Formatting

• Python: f"Value: {val:.2f}"
• Scala: s"Value: $val", f"Value: $val%.2f"

Control Flow

If-Else

• Python:

  if x > 0:
      return "pos"
  else:
      return "neg"
  

• Scala:

  if (x > 0) "pos" else "neg" // Expressions are preferred
  

For Loops

• Python: for i in range(10):
• Scala: for (i <- 0 until 10) { ... }

List Comprehension

• Python: [x * 2 for x in items if x > 0]
• Scala: items.filter(_ > 0).map(_ * 2) or for (x <- items if x > 0) yield x * 2