### 使用 `ftplib` 库实现简单的 FTP 文件传输 为了通过 Python 实现简单的文件上传到 FTP 服务器，可以利用标准库中的 `ftplib`。下面是一个完整的例子来展示如何连接至 FTP 服务器并上传一个本地文件： ```python from ftplib import FTP import os def upload_file(ftp_server, username, password, local_filepath, remote_path): """Upload a file to an FTP server.""" try: ftp = FTP(ftp_server) ftp.login(user=username, passwd=password) with open(local_filepath, 'rb') as f: filename = os.path.basename(f.name) ftp.storbinary('STOR %s' % os.path.join(remote_path, filename), f) # send the file print("File uploaded successfully.") except Exception as e: print(f"An error occurred while uploading the file: {e}") finally: ftp.quit() ``` 此函数接受五个参数：FTP 服务器地址、用户名、密码以及要上载的本地文件路径和远程目录位置[^1]。 对于下载操作，则可采用如下方式定义相应方法： ```python def download_file(ftp_server, username, password, remote_filename, save_to_localpath): """Download a file from an FTP server.""" try: ftp = FTP(ftp_server) ftp.login(user=username, passwd=password) with open(save_to_localpath, "wb") as fp: ftp.retrbinary(f'RETR {remote_filename}', fp.write) print("File downloaded successfully.") except Exception as e: print(f"An error occurred while downloading the file: {e}") finally: ftp.quit() ``` 上述两个函数分别实现了向指定 FTP 服务器发送文件与从该服务器获取文件的功能。