python ftp命令能实现断点续传吗

Python的ftplib库本身并不支持断点续传

首先，确保已经安装了ftplib和hashlib库。如果没有安装，可以使用以下命令安装：

pip install ftplib

然后，使用以下代码实现断点续传：

import os
import hashlib
from ftplib import FTP

def md5(file_path):
    hasher = hashlib.md5()
    with open(file_path, 'rb') as f:
        buf = f.read(65536)
        while buf:
            hasher.update(buf)
            buf = f.read(65536)
    return hasher.hexdigest()

def resume_download(ftp, remote_file_path, local_file_path):
    if not os.path.exists(local_file_path):
        with open(local_file_path, 'wb') as f:
            ftp.retrbinary('RETR ' + remote_file_path, f.write)
    else:
        local_md5 = md5(local_file_path)
        with open(local_file_path, 'rb') as f:
            ftp.sendcmd('TYPE I')
            remote_md5 = ftp.sendcmd('MD5 ' + remote_file_path)
            remote_md5 = remote_md5.split()[1]

        if local_md5 == remote_md5:
            print("File already fully downloaded.")
        else:
            with open(local_file_path, 'ab') as f:
                ftp.retrbinary('RETR ' + remote_file_path, f.write, rest=os.path.getsize(local_file_path))
            print("Download resumed from the last successfully downloaded byte.")

def main():
    ftp = FTP('ftp.example.com')
    ftp.login(user='username', passwd='password')
    remote_file_path = '/path/to/remote/file'
    local_file_path = '/path/to/local/file'

    resume_download(ftp, remote_file_path, local_file_path)

    ftp.quit()

if __name__ == '__main__':
    main()

请将ftp.example.com、username、password、/path/to/remote/file和/path/to/local/file替换为实际的FTP服务器地址、用户名、密码、远程文件路径和本地文件路径。这个脚本将尝试从上次成功下载的字节处继续下载文件。如果文件已经完全下载，它将输出相应的消息。