Python to Swift

Free Python to Swift Code Converter

No email required. 100% free. Done in 30 seconds.

Transform your code from Python to Swift with our free AI-based code convertion tool. If you like what you see, we also create documentation for your code! We don't ever store your code or any representation of it in our databases, but it will be shared with the LLM of our choice for processing.

Other tools

Ionic + Angular

Angular

Django

.NET

Flutter

Go

Java

Javascript

Kotlin

Laravel

NodeJS

PHP

Python

React Native

React

Ruby on Rails

Ruby

Rust

Spring

Swift

How to convert from Python to Swift

Introduction: Free Python to Swift Code Converter

Transitioning from Python to Swift can be challenging but rewarding. Both languages have distinctive syntaxes, libraries, and runtime environments. If you're proficient in Python and looking to rewrite or port your code to Swift, you’ll need to understand the core differences and similarities between the two languages.

Differences Between Python and Swift

Dynamically Typed vs Statically Typed

Python is a dynamically typed language, meaning you don't need to declare the type of a variable explicitly. Swift, on the other hand, is statically typed, which requires explicit type declarations.

Python Example:

x = 5
y = "Hello"

Swift Example:

var x: Int = 5
var y: String = "Hello"

Interpreted vs Compiled

Python is an interpreted language, where each line of code is executed on the fly. Swift is a compiled language, meaning that code needs to be compiled into machine code before it can be executed.

Syntax Conversion: Python to Swift

Variables and Constants

In Python, variables can be reassigned to a different type, whereas in Swift, variables (var) and constants (let) are more strictly defined.

Python:

age = 30
age = "Thirty"

Swift:

var age = 30
//incorrect: age = "Thirty"
let name: String = "John"

Data Structures

Lists and Arrays

Python lists can hold elements of different types. Swift arrays are type-specific.

Python:

numbers = [1, 2, 3, "four"]

Swift:

var numbers: [Any] = [1, 2, 3, "four"] // Using Any for mixed types
var intNumbers: [Int] = [1, 2, 3, 4] // For integers only

Dictionaries to Dictionaries

Key-value pairs in Python’s dictionary are similar to Swift's dictionaries but require type specification.

Python:

person = {"name": "Alice", "age": 30}

Swift:

var person: [String: Any] = ["name": "Alice", "age": 30]

Functions

Basic Functions

Function definitions in Swift are similar to Python but require type annotations for parameters and return types.

Python:

def greet(name):
    return "Hello, " + name

Swift:

func greet(name: String) -> String {
    return "Hello, " + name
}

Lambda Functions

Lambda functions are brief in Python, whereas Swift uses closures.

Python:

add = lambda x, y: x + y

Swift:

let add = { (x: Int, y: Int) -> Int in
    return x + y
}

Control Flow

If Statements

If statements in Swift require parentheses around the condition and curly braces for the body.

Python:

if x > 5:
    print("x is greater than 5")

Swift:

if (x > 5) {
    print("x is greater than 5")
}

For Loops

Python's for loop iterates over a sequence, while Swift's for loop often uses ranges.

Python:

for i in range(5):
    print(i)

Swift:

for i in 0..<5 {
    print(i)
}

Error Handling

Try-Except to Do-Catch

Error handling in Python employs try-except blocks, whereas Swift uses do-catch blocks.

Python:

try:
    # code that may raise an exception
except Exception as e:
    # code that runs if an exception occurs

Swift:

do {
    // code that may throw an error
} catch {
    // code that runs if an error is thrown
}

Classes and Protocols

Classes

The class definitions in Python and Swift look somewhat similar but have different initialization and inheritance rules.

Python:

class Animal:
    def __init__(self, name):
        self.name = name

    def speak(self):
        return "Sound"

Swift:

class Animal {
    var name: String

    init(name: String) {
        self.name = name
    }

    func speak() -> String {
        return "Sound"
    }
}

Conclusion

Converting Python code to Swift involves understanding the fundamental differences and similarities in syntax, type system, and execution model. By following the examples above, you can start translating your Python code to Swift, leveraging Swift’s type safety and performance benefits. This guide serves as a free Python to Swift code converter, offering you the basic tools to make the transition smoother.

Document your code using AI

Sign up now
& free your developers' time

Start for free

Join thousands of companies documenting their code using AI.

Frequently Asked Questions

This free AI tool does its best to generate professional documentation. However, it's missing some context from other related files. The paid version takes into account different files to generate documentation for each use case, apart from the documentation of every file. You have also the possibility of add custom concepts to improve the knowledge of your codebase.

No. You don't have to enter any personal information to use Codex's free code documentation tool — it's 100% free.

No. An encrypted version of your code is stored only while its being processed and it's deleted immediately.

If you can work with a custom Azure model in your own account, let us know. If not, Codex also works with open source models that can run on-premises, on your own servers, so your data is always yours. Feel free to get in touch with us!