python code in javascript

Python code cannot be executed directly in JavaScript as they are distinct programming languages. However, Python code can be converted or transpiled into JavaScript code using tools like Transcrypt, Brython, Pyodide or even Babel to some extent.

Transcrypt is a Python to JavaScript transpiler that converts Python code into JavaScript code. Brython is an implementation of Python 3 in JavaScript which allows to run Python code in the browser. Pyodide is a Python runtime in the browser which allows to run Python code with a minimal setup. Babel is a JavaScript transpiler which can be used to transpile subset of Python syntax into JavaScript.

Here's an example of Python code being transpiled into JavaScript using Transcrypt:

main.py
# Python
def add(a, b):
    return a + b

print(add(2, 3))
59 chars
6 lines

index.tsx
// Transpiled JavaScript
"use strict";
var $globals = {};
$globals.add = function(a, b) {
    return (a + b);
};
console.log($globals.add(2, 3));
146 chars
8 lines

Note that not all Python syntax can be transpiled into JavaScript, there are limitations to what can be done. Furthermore, even if transpiled, the resulting code may not always behave identically to the original Python code due to differences between the two languages. Therefore, it's important to choose the right tools and approach when trying to achieve Python-JavaScript interoperability.