What are concurrent futures in Python?

What are concurrent futures in Python?

Concurrent futures in Python is a module that provides a high-level interface for asynchronously executing callables using threads or processes.

How do I use the ThreadPoolExecutor?

You can use ThreadPoolExecutor by importing it from the concurrent.futures module and then creating an instance, specifying the number of threads.

Can you show me a simple example?

Sure! Here's a basic example:

from concurrent.futures import ThreadPoolExecutor

def task(n):
    return n * n

with ThreadPoolExecutor(max_workers=3) as executor:
    results = list(executor.map(task, range(5)))
print(results)  # Output: [0, 1, 4, 9, 16]

What about using ProcessPoolExecutor instead?

ProcessPoolExecutor works similarly but uses separate processes instead of threads, which is useful for CPU-bound tasks.