brython-dev/brython

Health v2 · maintenance only

Adoption not part of the score

6611 stars · 535 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Brython is an implementation of Python 3 that runs entirely in the web browser, loaded as a JavaScript file and executing Python code embedded in HTML via <script type="text/python"> tags. It provides bindings to the DOM, events, HTML5/CSS3, and interop with existing JavaScript libraries like jQuery and D3, and ships a Python standard library subset usable client-side.

Use cases

• run python code in the browser
• replace javascript with python for a web frontend
• write client-side web apps in python
• embed python scripts directly in html pages
• manipulate dom elements and events using python
• use python standard library modules in the browser
• teach python with zero-install browser examples
• interface python with javascript libraries like jquery or d3

When to choose

• you want to build browser-based interfaces in Python instead of JavaScript
• you need a zero-install or no-build-toolchain way to run Python client-side (e.g., education, demos)
• you want to reuse Python code or stdlib modules in the browser
• you need DOM/event handling in Python with access to existing JS libraries
• you want to avoid compiling to JavaScript and just add a script tag

When to avoid

• you need maximum frontend performance, as interpreted-in-browser Python is slower than native JavaScript
• you are building a large production SPA that benefits from the mature JavaScript/TypeScript ecosystem and tooling
• you need server-side execution or filesystem access, which Brython's browser context excludes
• your project depends on C extension packages (numpy, etc.) that Brython cannot run
• you need strong typing and npm-based tooling for team development

Facets

framework · maturity active

interpreter compiler frontend-framework programming-language developer-tools web-development frontend programming-languages compilers cross-platform browser python-in-browser python-to-javascript transpiler dom-manipulation javascript-interop client-side-python html5 python3 cdn-usage script-tag

Member repositories

For agents

markdown · JSON · MCP: product_card(name="brython-dev/brython")