PyScript
Jesús Martínez Blanco
Principal Data Scientist
@
What is PyScript
- A Javascript library to run Python in the browser
- Open Source project from Anaconda
- Built on Pyodide (Python on WebAssembly)
check pyscript.net
Binary instruction format for the web
(we can run compiled code in the browser)
- No server needed: client side execution
- Combines Python and JS easily
- Interactive apps and notebooks in web pages
PyScript: Pros and Cons
PROS
- Slower than native Javascript
- Not all Python packages are supported (no C extensions)
- Large initial page load (Pyodide is ~8Mb)
CONS
PyScript: How to
Put this in the <head>
<link rel="stylesheet" href="https://pyscript.net/releases/2025.7.2/core.css" />
<script type="module" src="https://pyscript.net/releases/2025.7.2/core.js"></script><script type="py" src="py/main.py" config="py/pyscript.toml"></script>Write a .toml file listing the python libraries used in your script (+ some info)
Make your .py file part of the app
name = "My awesome pyscript app"
description = "Just a simple demo app"
packages = ["pandas", "plotly"]Path to your Python script
Path to your
toml script
PyScript: How to
Here is an example of Python script as contents of main.py
from pyscript import display
import sys
display(sys.version)pyscript
By chumo
