python多线程文件备份

以下是一个简单的Python多线程文件备份程序示例：

import os
import shutil
import threading

def backup(source, destination):
    shutil.copy(source, destination)

if __name__ == '__main__':
    source_dir = '/path/to/source/directory'
    destination_dir = '/path/to/destination/directory'
    num_threads = 4

    # create destination directory if it does not exist
    if not os.path.exists(destination_dir):
        os.makedirs(destination_dir)

    # get list of files to backup
    files_to_backup = [os.path.join(source_dir, f) for f in os.listdir(source_dir) if os.path.isfile(os.path.join(source_dir, f))]

    # calculate number of files per thread
    files_per_thread = len(files_to_backup) // num_threads

    # create threads for backup
    threads = []
    for i in range(num_threads):
        start = i * files_per_thread
        end = (i + 1) * files_per_thread if i < num_threads - 1 else len(files_to_backup)
        thread = threading.Thread(target=backup, args=(files_to_backup[start:end], destination_dir))
        thread.start()
        threads.append(thread)

    # wait for all threads to complete
    for thread in threads:
        thread.join()

    print('Backup complete!')

这个程序将一个目录中的所有文件备份到另一个目录中。程序首先创建目标目录（如果不存在），然后获取要备份的文件列表。接下来，程序将文件列表分成多个线程，每个线程负责备份一部分文件。每个线程都调用`backup`函数，该函数将源文件复制到目标目录中。最后，程序等待所有线程完成后输出备份完成的消息。