Learn PYSCRIPT with Real Code Examples
Updated Nov 26, 2025
Architecture
PyScript runs on Pyodide compiled to WebAssembly
Python code executed client-side in browser sandbox
Integration with HTML via `<py-script>` elements
JavaScript bridge allows cross-language API calls
Optional loading of Python packages via CDN
Rendering Model
PyScript runs Python code via Pyodide compiled to WebAssembly
HTML `<py-script>` elements act as execution points
DOM updates and events handled via Element API
Python libraries dynamically imported through py-env
Output rendered directly in browser without server
Architectural Patterns
Client-side execution model
WebAssembly-based Python interpreter
DOM integration and event-driven architecture
Dynamic package loading
Sandboxed environment for safe execution
Real World Architectures
Educational interactive Python tutorials
Prototyping web-based data visualizations
Interactive widgets embedded in documentation
Client-side Python demos for blogs and websites
Hybrid Python-JavaScript web applications
Design Principles
Bring Python to the browser seamlessly
Enable interactive Python in web pages
Leverage existing Python ecosystem
Bridge Python and JavaScript/DOM interaction
Encourage education, prototyping, and experimentation
Scalability Guide
Suitable for small- to medium-sized interactive apps
Heavy computation may require Web Workers or server offloading
Package caching recommended for performance
Async code helps maintain responsiveness
Optimize DOM manipulation for large UIs
Migration Guide
Update PyScript version in HTML
Check package versions in py-env
Test `<py-script>` code after version changes
Update DOM interactions if API changed
Consult release notes for breaking changes