Python REPL (in your browser, via Pyodide)
Run Python code right in your browser via Pyodide (CPython 3.x compiled to WebAssembly). Print, compute, and use the standard library — no install required. First run downloads ~10 MB (cached after).
(run your code to see output)
About this tool
This REPL runs Pyodide — a port of CPython to WebAssembly. The runtime (~10 MB) is downloaded from the jsdelivr CDN on first run and cached by your browser thereafter. Your code never leaves your machine.
Most of the Python standard library works (math, statistics, json, re, datetime, …). Many popular packages (numpy, pandas, scikit-learn) can be installed at runtime via micropip, but that's not exposed in this minimal UI; ask if you want it.
About Python REPL (in your browser, via Pyodide)
The Python REPL runs CPython in your browser through Pyodide, a build of Python compiled to WebAssembly. Type Python in the editor and run it to see printed output, computed results, and standard library calls without installing anything on your machine.
The first run downloads roughly 10 MB of the Pyodide runtime, which the browser then caches for later visits. Your code executes locally inside the browser tab rather than on a remote server, which makes the tool useful for quick experiments, teaching snippets, and testing small scripts.
Frequently asked questions
- Do I need Python installed to use this?
- No. The interpreter is provided by Pyodide and runs in the browser, so no local Python installation is required.
- Can I install packages with pip?
- Pyodide includes the standard library and supports many packages through micropip, though some libraries with native extensions are not available.
- Why is the first run slow?
- The first run downloads the WebAssembly Python runtime, about 10 MB; once cached, later runs start much faster.