Python FTP按日期获取最新文件

问题描述

我正在使用ftplib连接到ftp站点.我想获取最新上传的文件并下载.我能够连接到ftp服务器并列出文件，我也将它们放在列表中并转换为datefield.是否有任何功能/模块可以获取最近的日期并从列表中输出整行?

I am using ftplib to connect to an ftp site. I want to get the most recently uploaded file and download it. I am able to connect to the ftp server and list the files, I also have put them in a list and got the datefield converted. Is there any function/module which can get the recent date and output the whole line from the list?

#!/usr/bin/env python

import ftplib
import os
import socket
import sys


HOST = 'test'


def main():
    try:
        f = ftplib.FTP(HOST)
    except (socket.error, socket.gaierror), e:
        print 'cannot reach to %s' % HOST
        return
    print "Connect to ftp server"

    try:
        f.login('anonymous','[email protected]')
    except ftplib.error_perm:
        print 'cannot login anonymously'
        f.quit()
        return
    print "logged on to the ftp server"

    data = []
    f.dir(data.append)
    for line in data:
        datestr = ' '.join(line.split()[0:2])
        orig-date = time.strptime(datestr, '%d-%m-%y %H:%M%p')


    f.quit()
    return


if __name__ == '__main__':
    main()

---

已解决:

data = []
f.dir(data.append)
datelist = []
filelist = []
for line in data:
    col = line.split()
    datestr = ' '.join(line.split()[0:2])
    date = time.strptime(datestr, '%m-%d-%y %H:%M%p')
    datelist.append(date)
    filelist.append(col[3])

combo = zip(datelist,filelist)
who = dict(combo)

for key in sorted(who.iterkeys(), reverse=True):
   print "%s: %s" % (key,who[key])
   filename = who[key]
   print "file to download is %s" % filename
   try:
       f.retrbinary('RETR %s' % filename, open(filename, 'wb').write)
   except ftplib.err_perm:
       print "Error: cannot read file %s" % filename
       os.unlink(filename)
   else:
       print "***Downloaded*** %s " % filename
   return

f.quit()
return

一个问题，是否可以从字典中检索第一个元素?我在这里所做的是，for循环仅运行一次并退出，从而为我提供了第一个排序的值，这很好，但是我认为以这种方式进行操作不是一个好习惯.

One problem, is it possible to retrieve the first element from the dictionary? what I did here is that the for loop runs only once and exits thereby giving me the first sorted value which is fine, but I don't think it is a good practice to do it in this way..

推荐答案

，就像Martin Prikryl的回答一样:您应该使用排序方法:

with NLST, like Martin Prikryl response:you should use sorted method :

ftp = FTP(host="127.0.0.1", user="u",passwd="p")
ftp.cwd("/data")
file_name = sorted(ftp.nlst(), key=lambda x: ftp.voidcmd(f"MDTM {x}"))[-1]

这篇关于Python FTP按日期获取最新文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！