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Online Python compiler

Write Python code, add input if your program reads any, and press Run. Python 3.12, in your browser.

Python 3.12

main.py

Input (stdin)

Output

Press Run (or Ctrl+Enter) to see the output here.

What it supports

Python 3.12 in your browser

Python 3.12 with the whole standard library (collections, itertools, re, json, datetime, zoneinfo and more).
FastAPI, SQLAlchemy, httpx, Alembic and PyJWT are installed for the Building Apps lessons.
Standard input from the Input box, standard output and errors in the Output panel.
Each run stops after 5 seconds. Code up to 64 KB, input up to 16 KB.
No internet access and no files kept between runs.

Input

How to read input in Python

Programs that read from the keyboard get their input from the Input box. Type one value per line, then press Run. The program reads the lines in order, just as it would from a keyboard.

n = int(input())          # first line
a, b = map(int, input().split())  # two numbers on one line
import sys
rest = sys.stdin.read()    # everything that is left

Tip: if the output is empty or the run stops after 5 seconds, the program may be waiting for input that is not in the box.

Questions

Frequently asked questions

Do I need to install Python to use this compiler?

No. Your code runs on our servers with Python 3.12, so a browser on a laptop or a phone is enough.

How do I read input in Python here?

Type the input in the Input box, one value per line. input() reads one line each time it is called, and sys.stdin.read() reads everything. The whole box is given to your program when you press Run.

Can I use libraries such as NumPy or requests?

The standard library is always there. FastAPI, SQLAlchemy, httpx, Alembic and PyJWT are installed too. Programs have no internet access, so downloading data or installing packages does not work.

Learn

Learn Python step by step

This compiler is the same editor the Python course uses for its practice problems.

Open the Python course MentorNxt Python DSA 150

Looking for another language? Try the online Java compiler.