Python 3 Online Compiler & Code Runner
Our online Python compiler runs Python 3 directly inside your browser using WebAssembly. Because your code executes on your machine's CPU rather than a remote cloud server, execution is instantaneous with zero queue time, zero server lag, and zero tracking.
Instant In-Browser Execution
Powered by Pyodide WebAssembly. Code runs locally with zero network delay and zero latency.
Standard Input (stdin) Support
Pass custom test inputs, strings, arrays, or numbers to standard input just like in terminal.
Standard Library Included
Full support for Python's standard library: math, collections, heapq, itertools, bisect, and json.
Integrated DSA Problem Set
Switch straight from free coding to solving 370 curated interview problems with real test cases.
Popular Python 3 Examples
Hello World
Basic standard output print statement in Python 3.
print("Hello, DSA Tracker!")User Input (stdin)
Reading input from stdin and processing variables.
name = input("Enter your name: ")
age = int(input("Enter your age: "))
print(f"Hello {name}, you will be {age + 1} next year!")Two Sum Pattern (Hash Map)
O(n) optimal solution for the classic Two Sum interview problem.
def two_sum(nums, target):
seen = {}
for i, n in enumerate(nums):
diff = target - n
if diff in seen:
return [seen[diff], i]
seen[n] = i
return []
print(two_sum([2, 7, 11, 15], 9)) # Output: [0, 1]Ready to Practice Real Interview Problems in Python?
Solve 370 curated problems merged from Striver A2Z, Love Babbar 450, and Apna College with zero duplicate questions.
Frequently Asked Questions
Is this online Python compiler free to use?
Yes, 100% free with no daily limits and no signup required. You can run as much Python code as you want.
Does this Python compiler run on server or browser?
It runs directly in your web browser via WebAssembly (Pyodide). Your code stays on your device and executes with zero server lag.
Can I take user input in this Python compiler?
Yes. Open the Input tab in the console panel, type your input values, and use Python's standard `input()` function.
Can I use external libraries like numpy or pandas?
Standard library modules (math, collections, heapq, sys, json, re, itertools) work out-of-the-box. Heavy C-extension packages are not included to keep page load ultra-fast.