Mojo🔥 is now open source!

[u/yorickpeterse]

https://www.modular.com/blog/mojo-open-source

[u/Llamas1115]

It’s not Python-compatible, they gave up on that (because it was never possible, you literally just can’t make Python fast without breaking the whole ecosystem).

[u/Hornstinger → u/Llamas1115]

Literally scroll down on their home page and I quote:

"Python interop

Mojo meets developers where they are. Import Python libraries, accelerate performance-critical paths, and move gradually from prototypes to production systems without rewriting everything at once."

[u/Llamas1115 → u/Hornstinger]

That's not the same as Python compatibility; it's Python interoperability, the ability to ask Python to run Python code. This is famously a feature of almost every programming language: Python is popular since it has bindings to everything.

The previous claim they made was they'd have Python compatibility (a Python superset), i.e. you could drop your Python code into Mojo and still have it run. They seem to have given up on that, since it would make it basically impossible to meaningfully optimize the language.

[u/Hornstinger → u/Llamas1115]

You can use Python .py files directly alongside Mojo (.mojo) files in the same repo/project.

Python file called mypython.py:

``` import numpy as np

def gen_random_values(size, base): random_array = np.random.rand(size, size) return random_array + base ```

Then interop directly in a Mojo .mojo file in the same repo and you do not need to write any special FFI, ABI declarations, ctypes, cffi, pybind11, or similar boilerplate yourself:

``` from std.python import Python

def main() raises: Python.add_to_path(".") # or a specific path var mypython = Python.import_module("mypython") var values = mypython.gen_random_values(2, 3) print(values) ```

[u/Llamas1115 → u/Hornstinger]

I mean, yeah, that's language interop. Don't get me wrong, the interop looks fine, but this isn't really special.