如何在python线程池执行中为每10个完成列表添加延时？

import time
from concurrent.futures import ThreadPoolExecutor, as_completed

def task(n):
    print(f"Task {n} started")
    time.sleep(1)  # 模拟任务执行时间
    print(f"Task {n} completed")
    return n

def callback(future):
    future.result()  # 确保任务完成
    nonlocal count
    count += 1
    if count % 10 == 0:
        print(f"Pausing for 5 seconds after completing {count} tasks")
        time.sleep(5)  # 延时5秒

count = 0
with ThreadPoolExecutor(max_workers=5) as executor:
    futures = [executor.submit(task, i) for i in range(50)]
    for future in as_completed(futures):
        future.add_done_callback(callback)