如何在Windows上实现Python多处理？

import multiprocessing
import time

def worker(num):
    print(f"Worker {num}")
    time.sleep(2)
    print(f"Worker {num} finished")

if __name__ == "__main__":
    processes = []
    for i in range(4):
        process = multiprocessing.Process(target=worker, args=(i,))
        processes.append(process)
        process.start()

    for process in processes:
        process.join()

    print("All processes finished")