Python Playground: Run Code in Your Browser

Posted on July 10, 2026

Python Playground#

Write Python and run it right here in your browser. Nothing is installed and nothing leaves your machine: the code runs locally using a WebAssembly Python runtime. The first run downloads the runtime (a few seconds), then it is instant.

Great for trying the daily exercises, testing a pattern, or just experimenting.

Try it#

Python

def two_sum(nums, target):
    seen = {}
    for i, n in enumerate(nums):
        if target - n in seen:
            return [seen[target - n], i]
        seen[n] = i
    return []

print(two_sum([2, 7, 11, 15], 9))
print(two_sum([3, 2, 4], 6))

Edit the code above and hit Run. Try changing the input, or paste your own solution to one of the problems.

A sorting example#

Python

def quicksort(arr):
    if len(arr) <= 1:
        return arr
    pivot = arr[len(arr) // 2]
    left = [x for x in arr if x < pivot]
    mid = [x for x in arr if x == pivot]
    right = [x for x in arr if x > pivot]
    return quicksort(left) + mid + quicksort(right)

print(quicksort([5, 2, 9, 1, 5, 6]))

Want to see sorting animated instead? Visit the sorting visualizer. Ready for a structured path? Start the 60-day challenge.