Python pysftp下载失败，并显示"IOError:[Errno 21]是目录". [英] Python pysftp download fails with "IOError: [Errno 21] Is a directory"

问题描述

这是我的示例Python脚本，我想在其中将文件从SFTP服务器下载到本地.

Here is my sample Python script where I want to download a file from SFTP server to my local.

srv = pysftp.Connection(host=host, username=username, password=password, port=port, cnopts=connOption)
    with srv.cd(sftppath):
        data = srv.listdir()
        try:
            for infile in data:
                print infile
                srv.get(infile, destination, preserve_mtime=True)

我可以成功连接，并且列出了文件夹中的所有文件.但是，当我使用srv.get()将其下载到桌面时，出现以下错误，

I can connect successfully and it lists all files in the folder. But when I use srv.get() to download to my desktop I get following error,

IOError:[Errno 21]是目录:'/Users/ratha/Desktop'

IOError: [Errno 21] Is a directory: '/Users/ratha/Desktop'

错误堆栈；

Traceback (most recent call last):
  File "/Users/ratha/PycharmProjects/SFTPDownloader/handler.py", line 9, in <module>
    main()
  File "/Users/ratha/PycharmProjects/SFTPDownloader/handler.py", line 5, in main
    downloadSFTPFiles()
  File "/Users/ratha/PycharmProjects/SFTPDownloader/Utilities/SFTPConnector.py", line 49, in downloadSFTPFiles
    srv.get(infile, destination, preserve_mtime=True)
  File "/Users/ratha/PycharmProjects/SFTPDownloader/venv/lib/python2.7/site-packages/pysftp/__init__.py", line 249, in get
    self._sftp.get(remotepath, localpath, callback=callback)
  File "/Users/ratha/PycharmProjects/SFTPDownloader/venv/lib/python2.7/site-packages/paramiko/sftp_client.py", line 801, in get
    with open(localpath, "wb") as fl:
IOError: [Errno 21] Is a directory: '/Users/ratha/Desktop'

我在这里做错了什么?

推荐答案

堆栈跟踪实际上非常清晰.只需关注这两行:

The stack trace is actually really clear. Just focus on these two lines:

    with open(localpath, "wb") as fl:
IOError: [Errno 21] Is a directory: '/Users/ratha/Desktop'

很显然，pysftp尝试将/Users/ratha/Desktop作为文件进行打开以进行二进制写入，但运行不顺利，因为它已经是一个目录了. 文档将对此进行确认:

Clearly, pysftp tries to open /Users/ratha/Desktop as a file for binary write, which didn't go well because that is already, well, a directory. The documentation will confirm this:

localpath (str) –要复制目标的本地路径和文件名.如果未指定，则将文件复制到本地当前工作目录

localpath (str) – the local path and filename to copy, destination. If not specified, file is copied to local current working directory

因此，您需要确定要另存为的文件名，并使用(最佳实践)os.path.join('/Users/ratha/Desktop', filename)来获取路径和文件名，而不仅仅是路径.

Therefore you need to figure out the file name you want to save as, and use (best practice) os.path.join('/Users/ratha/Desktop', filename) to get a path and filename, instead of just a path.

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