import multiprocessing import datetime import time def worker(semaphore, count): semaphore.acquire() now = datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S') try: print(f"{now}: Work {count} is working... 剩余信号量：{semaphore.get_value()}") finally: time.sleep(10) semaphore.release() if __name__ == '__main__': manager = multiprocessing.Manager() # 指定信号量为3 semaphores = manager.Semaphore(3) workers = [] for i in range(10): worker_process = multiprocessing.Process(target=worker, args=(semaphores, i)) workers.append(worker_process) worker_process.start() 执行报错 FileNotFoundError: [WinError 2] 系统找不到指定的文件。

这个错误可能是因为在程序中使用了多进程，但是在Windows系统下运行多进程程序的时候，需要使用if __name__ == '__main__':来保护主程序不被子进程执行，否则会报出找不到文件的错误。

所以你需要将代码修改为：

import multiprocessing
import datetime
import time

def worker(semaphore, count):
    semaphore.acquire()
    now = datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')
    try:
        print(f"{now}: Work {count} is working...  剩余信号量：{semaphore.get_value()}")
    finally:
        time.sleep(10)
        semaphore.release()

if __name__ == '__main__':
    manager = multiprocessing.Manager()
    # 指定信号量为3
    semaphores = manager.Semaphore(3)
    workers = []
    for i in range(10):
        worker_process = multiprocessing.Process(target=worker, args=(semaphores, i))
        workers.append(worker_process)
        worker_process.start()

将主程序部分放在if __name__ == '__main__':语句块中，这样就能够避免这个错误了。