在 Python 中获取最新的 FTP 文件夹名称

Get the latest FTP folder name in Python(在 Python 中获取最新的 FTP 文件夹名称)

问题描述

我正在尝试编写一个脚本来从最新的子目录中获取最新的文件Python中的FTP服务器目录.我的问题是我无法弄清楚最新的子目录.有两个选项可用，子目录有 ctime 可用.在目录名称中还提到了创建目录的日期.但我不知道如何获取最新目录的名称.我想出了以下方法(希望服务器端按最新的ctime排序).如果第一个对象是最新目录，我已经按照以下方式完成了它.

I am trying to write a script to get the latest file from the latest sub- directory of FTP server in Python. My problem is I am unable to figure out the latest sub-directory. There are two options available, sub-directories have ctime available. Also in directory name date is mentioned that on which date directory was created. But I do not know how to get the name of the latest directory. I have figured out the following way (hoping for the server side to be sorted by latest ctime). I have done it the following way which will work if first object is the latest directory.

import ftplib 
import os
import time

ftp = ftplib.FTP('test.rebex.net','demo', 'password')
ftp.cwd(str((ftp.nlst())[0])) #if directory is sorted in descending order by date.

但是有什么方法可以通过 ctime 或目录名称中的日期找到确切的目录?

But is there any way where I will find the exact directory by ctime or by date in directory name ?

非常感谢各位.

推荐答案

如果你的 FTP 服务器支持 MLSD 命令，解决方案很简单:

If your FTP server supports MLSD command, a solution is easy:

• 如果您想根据修改时间戳做出决定:

• If you want to base the decision on a modification timestamp:

entries = list(ftp.mlsd())
# Only interested in directories
entries = [entry for entry in entries if entry[1]["type"] == "dir"]
# Sort by timestamp
entries.sort(key = lambda entry: entry[1]['modify'], reverse = True)
# Pick the first one
latest_name = entries[0][0]
print(latest_name)

# Sort by filename
entries.sort(key = lambda entry: entry[0], reverse = True)

如果您需要依赖过时的 LIST 命令，则必须解析它返回的专有列表.

If you need to rely on an obsolete LIST command, you have to parse a proprietary listing it returns.

一个常见的 *nix 列表如下:

A common *nix listing is like:

drw-r--r-- 1 user group           4096 Mar 26  2018 folder1-20180326
drw-r--r-- 1 user group           4096 Jun 18 11:21 folder2-20180618
-rw-r--r-- 1 user group           4467 Mar 27  2018 file-20180327.zip
-rw-r--r-- 1 user group         124529 Jun 18 15:31 file-20180618.zip

有了这样的清单，这段代码就可以了:

With a listing like this, this code will do:

• 如果您想根据修改时间戳做出决定:

• If you want to base the decision on a modification timestamp:

lines = []
ftp.dir("", lines.append)

latest_time = None
latest_name = None

for line in lines:
    tokens = line.split(maxsplit = 9)
    # Only interested in directories
    if tokens[0][0] == "d":
        time_str = tokens[5] + " " + tokens[6] + " " + tokens[7]
        time = parser.parse(time_str)
        if (latest_time is None) or (time > latest_time):
            latest_name = tokens[8]
            latest_time = time

print(latest_name)

lines = []
ftp.dir("", lines.append)

latest_name = None

for line in lines:
    tokens = line.split(maxsplit = 9)
    # Only interested in directories
    if tokens[0][0] == "d":
        name = tokens[8]
        if (latest_name is None) or (name > latest_name):
            latest_name = name

print(latest_name)

某些 FTP 服务器可能会在 LIST 结果中返回 . 和 .. 条目.您可能需要过滤这些内容.

Some FTP servers may return . and .. entries in LIST results. You may need to filter those.

部分基于:Python FTP 按日期获取最新文件.

如果文件夹不包含任何文件，只有子文件夹，还有其他更简单的选项.

If the folder does not contain any files, only subfolders, there are other easier options.

• 如果你想根据修改时间戳做出决定，并且服务器支持非标准的 -t 开关，你可以使用:

lines = ftp.nlst("-t")
latest_name = lines[-1]

参见如何获取FTP文件夹中按修改时间排序的文件

如果要使用文件名:

lines = ftp.nlst()
latest_name = max(lines)

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