Runs in your browser
Real CPython compiled to WebAssembly. Your code never leaves your device, so it is fast, private and works on any laptop or phone.
Online Python Compiler
Write, run and share Python 3 – it runs in your browser, nothing to install.
Press Run to see your program's output here.
Step 0 of 0
Input for input() one value per line
Variables and function calls appear here.
➜ line that runs next · ➜ line that just ran · use ← → keys to step
See every step
The visualiser replays your program line by line, drawing variables, lists, dictionaries, objects and the call stack.
Interactive input()
Your program pauses at every input() and you type the answer in the console, like a real terminal – perfect for games, menus and exam programs.
Share with one click
Save & share gives you a short link for your teacher, friend or interviewer – no account needed.
How to use the online Python compiler
- Write or pick an example. Type in the editor or choose a program from Examples.
- Answer input() as you go. When your program asks a question, type the answer right in the console and press Enter – or pre-fill the Input box, one value per line.
- Press Run (or Ctrl/⌘ + Enter). Output and errors appear in the console.
- Learn from errors. Read the last line of a traceback first – it names the problem and the line.
New to Python? Follow the free Python tutorial (every example has a Run button), then test yourself with today's Daily Code Challenge.
Frequently asked questions
Is this Python compiler free?
Yes. It is completely free, needs no sign-up and has no limits on how often you run code.
Where does my code run?
In your own browser. LearnFrenzy uses Pyodide (CPython compiled to WebAssembly), so your program never leaves your device unless you choose "Save & share".
Can I use input()?
Yes. When your program calls input(), it pauses and you type the answer directly in the console, then press Enter – just like a terminal. You can also pre-fill answers in the Input box, one per line, to run without stopping.
Which Python version and libraries are available?
A recent Python 3 with the full standard library. Popular packages such as numpy, pandas and matplotlib are downloaded automatically the first time you import them.
How do I share my program?
Press "Save & share" to get a short link. Anyone who opens it sees your code and can run or change it; their changes do not affect your link.
What if my program never stops?
Press Stop, or wait 20 seconds and the run is stopped automatically. That usually means a while loop whose condition never becomes false.