python从ftp下载文件

在Python中，你可以使用`ftplib`模块来从FTP服务器下载文件。这是一个基础的步骤指南：

import ftplib

def download_file_from_ftp(host, username, password, local_path, remote_file):
    # 创建FTP对象并连接到服务器
    ftp = ftplib.FTP(host)
    ftp.login(user=username, passwd=password)

    try:
        # 进入目标目录
        ftp.cwd(remote_directory if remote_directory else '')

        # 使用"RETR"命令下载文件
        with open(local_path, 'wb') as file:
            ftp.retrbinary('RETR ' + remote_file, file.write)

        print(f"{remote_file} downloaded successfully.")
    
    except Exception as e:
        print(f"Error occurred while downloading {remote_file}: {e}")
    
    finally:
        # 断开FTP连接
        ftp.quit()

# 调用函数，传入 FTP 服务器信息和本地保存路径
download_file_from_ftp("your_server_address", "your_username", "your_password", "/path/to/save/downloaded/file", "remote_file_name")