Pyodide is a project that compiles CPython to WebAssembly, allowing you to run a full Python interpreter in the browser. It supports many common Python libraries (like NumPy, Pandas etc.) without needing a server. All code runs locally in your browser.

Which Python modules are supported?

Pyodide includes many standard library modules including math, json, re, datetime, collections, itertools, random, string, functools, operator and more. Some C-extension modules (like NumPy, Pandas) can be installed via micropip but first load may be slower.

Where is the code executed? Is it safe?

Code runs entirely in your browser via WebAssembly and is never uploaded to any server. Python code executes in the browser sandbox environment, ensuring your code and data are secure.

Why is the first load slow?

Pyodide runtime needs to download ~10-20MB of WebAssembly files and Python standard library. The first load is cached by your browser, so subsequent visits will be faster. A loading indicator is shown during the process.

Python Runner

Online Python Code Runner

Snippets:

Python Code Editor

Output

# Output will be displayed here after running

Python Online Runner Guide

Key Features

Python Execution - Run Python code in the browser (powered by Pyodide / WebAssembly)
Stdout Capture - Captures print() output and error messages
Common Modules - Supports math, json, re, datetime, collections, itertools and more
Code Snippets - Built-in Python example snippets for quick loading
Error Location - Displays error messages with line numbers
Execution Time - Shows code runtime

Use Cases

Quickly test Python code snippets
Learn and practice Python syntax
Debug regular expressions and string processing
Validate data processing logic
Test list comprehensions, dict operations, etc.

Python Runner

Python Online Runner Guide

Key Features

Use Cases

常见问题

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