Python 3.13 Changes [repack] May 2026

# Without cache start = time.perf_counter() result = fibonacci(n) normal_time = time.perf_counter() - start

async def main_new_way(): # Python 3.13 - same syntax, but ~10-15% faster # Task creation and scheduling overhead reduced async with asyncio.TaskGroup() as tg: tasks = [tg.create_task(process_item(i)) for i in range(1000)] return [task.result() for task in tasks] async def benchmark(): start = time.perf_counter() await main_old_way() old_time = time.perf_counter() - start python 3.13 changes

print(f"Fibonacci(n) = result") print(f"Normal: normal_time:.3fs") print(f"Cached: cached_time:.3fs") class Point: slots = ('x', 'y') # Even faster in 3.13 # Without cache start = time