Python Code Editor — Run Python in Your Browser
Write and execute Python code entirely in your browser — powered by Pyodide (WebAssembly CPython). Simulate stdin input, view stdout and stderr in a clean console, and keep your workspace auto-saved between sessions. No installation, no server, no account needed.
Included Python Editor Features
Python Code Editor
Full-height editor with line numbers, auto-indent, tab-to-spaces, and bracket auto-pairing.
Stdin Input Simulator
Provide multi-line standard input — each line feeds one input() call in your program in order.
Output Console
Preformatted console showing stdout, stderr, and the process return code after every run.
Sample Code Snippets
Load Hello World, Input & Sum, or Fibonacci examples to get started instantly.
How to Run Python in Your Browser
Write or paste Python
Type your Python code in the editor. Auto-indent and bracket pairing help you code faster.
Add input values
If your code calls input(), put each value on a new line in the Input panel below the editor.
Click Run Python
Pyodide (WebAssembly CPython) executes your code locally — no internet connection needed after load.
Read the output
Stdout and stderr appear in the Output Console along with the process return code.
Frequently Asked Questions
- How does Python run without a server?
- ToolMint uses Pyodide — a full CPython interpreter compiled to WebAssembly. It runs natively in your browser tab with no backend server involved.
- Can I simulate user input with input()?
- Yes. Type each input value on a separate line in the Input panel. The editor intercepts input() calls and feeds them from your provided lines in order.
- Is my code saved if I refresh the page?
- Yes. Both your code and stdin values are automatically persisted to localStorage and restored on your next visit.
- Can I use Python libraries like math or random?
- Yes. The Python standard library is fully available via Pyodide. Third-party packages that ship with Pyodide (like numpy) can also be imported.
- Why does the first run take a moment?
- On first load, Pyodide downloads the WebAssembly CPython runtime. Subsequent runs on the same page are instant.