Show HN: Online Python Compiler with Libraries

#1

Post by andycloke » Tue, Mar 11, 2025, 12:52 PM UTC

Hey HN, I just launched this online Python compiler which lets you use popular Python libraries like requests, Matplotlib, Plotly, Pandas, NumPy etc. online.

It uses Pyodide to execute Python in the browser using WebAssembly.

Show HN: Online Python Compiler with Libraries
cliprun.com

Re: Show HN: Online Python Compiler with Libraries

#2

Post by metadat » Sat, Mar 15, 2025, 3:55 AM UTC

  import requests 
  
  r = requests.get('https://theonion.com')
  
  print(r.text)

Hmm, I wonder if you could use subprocess to fetch and run any binary. What kind of sandbox is this running in, and what are the limits?

Running arbitrary untrusted code seems like a potential security issue.

Edit: @porridgeraisin Got it, thanks! Does this mean outbound http requests only work with domains that support arbitrary requests via `Access-Control-Allow-Origin: *` ?

Re: Show HN: Online Python Compiler with Libraries

#3

Post by sekizsonsuz » Sat, Mar 15, 2025, 4:01 AM UTC

I don't understand. There is no compiling at all. It's interpereter and it's basically based on https://pyodide.org/

Re: Show HN: Online Python Compiler with Libraries

#4

Post by porridgeraisin » Sat, Mar 15, 2025, 4:51 AM UTC

metadat wrote: post #2

import requests r = requests.get('https://theonion.com') print(r.text) Hmm, I wonder if you could use subprocess to fetch and run any binary. What kind of sandbox is this running in, and what are the limits? Running arbitrary untrusted code seems like a potential security issue. Edit: @porridgeraisin Got it, thanks! Does this mean outbound http requests only work with domains that support arbitrary requests via `Acce…

It runs on pyodide, i.e, a wasm interpreter that runs entirely in your browser.

Re: Show HN: Online Python Compiler with Libraries

#5

Post by gardnr » Sat, Mar 15, 2025, 4:53 AM UTC

Great project! Nice work!

It reminds me a bit of marimo: https://docs.marimo.io/guides/publishing/

Re: Show HN: Online Python Compiler with Libraries

#6

Post by [deleted] » Sat, Mar 15, 2025, 4:55 AM UTC

porridgeraisin wrote: post #4

metadat wrote: post #2

import requests r = requests.get('https://theonion.com') print(r.text) Hmm, I wonder if you could use subprocess to fetch and run any binary. What kind of sandbox is this running in, and what are the limits? Running arbitrary untrusted code seems like a potential security issue. Edit: @porridgeraisin Got it, thanks! Does this mean outbound http requests only work with domains that support arbitrary requests via `Acce…

It runs on pyodide, i.e, a wasm interpreter that runs entirely in your browser.

[deleted]

Re: Show HN: Online Python Compiler with Libraries

#7

Post by Rush2112 » Sat, Mar 15, 2025, 7:41 AM UTC

Hi, great project! Can you add the library pylan? https://pypi.org/project/pylan-lib/

Re: Show HN: Online Python Compiler with Libraries

#8

Post by andycloke » Sat, Mar 15, 2025, 7:50 AM UTC

Rush2112 wrote: post #7

Hi, great project! Can you add the library pylan? https://pypi.org/project/pylan-lib/

Yes! To use pylan:

- Click on the Clip name (the default one is 'Use Python Libraries') - Click 'Manage packages' - Enter 'pylan-lib' and Click 'Add' - Click 'Run'

The package will be installed, and the code will run!

The list of libraries is only a small subset of the compatible libraries - I should make that way clearer.

Re: Show HN: Online Python Compiler with Libraries

#9

Post by andycloke » Sat, Mar 15, 2025, 7:57 AM UTC

metadat wrote: post #2

import requests r = requests.get('https://theonion.com') print(r.text) Hmm, I wonder if you could use subprocess to fetch and run any binary. What kind of sandbox is this running in, and what are the limits? Running arbitrary untrusted code seems like a potential security issue. Edit: @porridgeraisin Got it, thanks! Does this mean outbound http requests only work with domains that support arbitrary requests via `Acce…

Maker here! Runs in an isolated Web Worker using Web Assembly, via Pyodide. Everything runs locally in your browser - no file system or other access. Scheduled run (paid plan) run on AWS lambda.

So, yes, sadly, network requests only work with domains with Access-Control-Allow-Origin: *. I'm looking at adding a backend CORS proxy to fix this.

We also have a Chrome extension with no CORS limitation. The extension lets you right-click Python code snippets on basically any site (Claude, ChatGPT, Deepseek etc.) to run it instantly.

https://chromewebstore.google.com/detail/python-code-runner/...

Re: Show HN: Online Python Compiler with Libraries

#10

Post by Rush2112 » Sat, Mar 15, 2025, 7:58 AM UTC

andycloke wrote: post #8

Rush2112 wrote: post #7

Hi, great project! Can you add the library pylan? https://pypi.org/project/pylan-lib/

Yes! To use pylan: - Click on the Clip name (the default one is 'Use Python Libraries') - Click 'Manage packages' - Enter 'pylan-lib' and Click 'Add' - Click 'Run' The package will be installed, and the code will run! The list of libraries is only a small subset of the compatible libraries - I should make that way clearer.

ah ok. Thanks!