python-scala-libraries

Python to Scala Library Mappings

JSON Handling

# Python
import json

data = {"name": "Alice", "age": 30}
json_str = json.dumps(data)
parsed = json.loads(json_str)

# With dataclass
from dataclasses import dataclass, asdict

@dataclass
class Person:
    name: str
    age: int

person = Person("Alice", 30)
json.dumps(asdict(person))

// Scala - circe (most popular)
import io.circe._
import io.circe.generic.auto._
import io.circe.syntax._
import io.circe.parser._

case class Person(name: String, age: Int)

val person = Person("Alice", 30)
val jsonStr: String = person.asJson.noSpaces
val parsed: Either[Error, Person] = decode[Person](jsonStr)

// Scala - play-json
import play.api.libs.json._

case class Person(name: String, age: Int)
implicit val personFormat: Format[Person] = Json.format[Person]

val json = Json.toJson(person)
val parsed = json.as[Person]

Date and Time

# Python
from datetime import datetime, date, timedelta
import pytz

now = datetime.now()
today = date.today()
specific = datetime(2024, 1, 15, 10, 30)
formatted = now.strftime("%Y-%m-%d %H:%M:%S")
parsed = datetime.strptime("2024-01-15", "%Y-%m-%d")
tomorrow = now + timedelta(days=1)

# Timezone
utc_now = datetime.now(pytz.UTC)

// Scala - java.time (recommended)
import java.time._
import java.time.format.DateTimeFormatter

val now = LocalDateTime.now()
val today = LocalDate.now()
val specific = LocalDateTime.of(2024, 1, 15, 10, 30)
val formatted = now.format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"))
val parsed = LocalDate.parse("2024-01-15")
val tomorrow = now.plusDays(1)

// Timezone
val utcNow = ZonedDateTime.now(ZoneOffset.UTC)
val instant = Instant.now()

File Operations

# Python
from pathlib import Path
import os

# Reading
with open("file.txt", "r") as f:
    content = f.read()
    lines = f.readlines()

# Writing
with open("file.txt", "w") as f:
    f.write("Hello")

# Path operations
path = Path("dir/file.txt")
path.exists()
path.parent
path.name
path.suffix
list(Path(".").glob("*.txt"))
os.makedirs("new/dir", exist_ok=True)