How to delete files with a Python script from a FTP server which are older than 7 days?(如何使用 Python 脚本从 FTP 服务器中删除超过 7 天的文件?)

本文介绍了如何使用 Python 脚本从 FTP 服务器中删除超过 7 天的文件?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我想编写一个 Python 脚本，允许我在文件达到一定年龄后从 FTP 服务器删除文件.我准备了下面的 scipt 但它抛出了错误消息: WindowsError: [Error 3] The system cannot find the path specified: '/test123/*.*'

I would like to write a Python script which allows me to delete files from a FTP Server after they have reached a certain age. I prepared the scipt below but it throws the error message: WindowsError: [Error 3] The system cannot find the path specified: '/test123/*.*'

有人知道如何解决这个问题吗?提前谢谢！

Do someone have an idea how to resolve this issue? Thank you in advance!

import os, time
from ftplib import FTP

ftp = FTP('127.0.0.1')
print "Automated FTP Maintainance"
print 'Logging in.'
ftp.login('admin', 'admin')

# This is the directory that we want to go to
path = 'test123'
print 'Changing to:' + path
ftp.cwd(path)
files = ftp.retrlines('LIST')
print 'List of Files:' + files 
#--everything works fine until here!...

#--The Logic which shall delete the files after the are 7 days old--
now = time.time()
for f in os.listdir(path):
  if os.stat(f).st_mtime < now - 7 * 86400:
    if os.path.isfile(f):
        os.remove(os.path.join(path, f))
except:
    exit ("Cannot delete files")

print 'Closing FTP connection'
ftp.close()

推荐答案

好的.假设您的 FTP 服务器支持 MLSD 命令，请使用以下代码制作一个模块(这是我用来将远程 FTP 站点与本地目录同步的脚本中的代码):

OK. Assuming your FTP server supports the MLSD command, make a module with the following code (this is code from a script I use to sync a remote FTP site with a local directory):

# for python ≥ 2.6
import sys, os, time, ftplib
import collections
FTPDir= collections.namedtuple("FTPDir", "name size mtime tree")
FTPFile= collections.namedtuple("FTPFile", "name size mtime")

class FTPDirectory(object):
    def __init__(self, path='.'):
        self.dirs= []
        self.files= []
        self.path= path

    def getdata(self, ftpobj):
        ftpobj.retrlines('MLSD', self.addline)

    def addline(self, line):
        data, _, name= line.partition('; ')
        fields= data.split(';')
        for field in fields:
            field_name, _, field_value= field.partition('=')
            if field_name == 'type':
                target= self.dirs if field_value == 'dir' else self.files
            elif field_name in ('sizd', 'size'):
                size= int(field_value)
            elif field_name == 'modify':
                mtime= time.mktime(time.strptime(field_value, "%Y%m%d%H%M%S"))
        if target is self.files:
            target.append(FTPFile(name, size, mtime))
        else:
            target.append(FTPDir(name, size, mtime, self.__class__(os.path.join(self.path, name))))

    def walk(self):
        for ftpfile in self.files:
            yield self.path, ftpfile
        for ftpdir in self.dirs:
            for path, ftpfile in ftpdir.tree.walk():
                yield path, ftpfile

class FTPTree(FTPDirectory):
    def getdata(self, ftpobj):
        super(FTPTree, self).getdata(ftpobj)
        for dirname in self.dirs:
            ftpobj.cwd(dirname.name)
            dirname.tree.getdata(ftpobj)
            ftpobj.cwd('..')

单目录案例

如果您想处理目录中的文件，您可以:

single directory case

If you want to work on the files of a directory, you can:

import ftplib, time

quite_old= time.time() - 7*86400 # seven days

site= ftplib.FTP(hostname, username, password)
site.cwd(the_directory_to_work_on) # if it's '.', you can skip this line
folder= FTPDirectory()
folder.getdata(site) # get the filenames
for path, ftpfile in folder.walk():
    if ftpfile.mtime < quite_old:
        site.delete(ftpfile.name)

这应该做你想做的.

现在，如果这应该递归工作，您必须在单目录案例"的代码中进行以下两项更改:

Now, if this should work recursively, you'll have to do the following two changes in the code for "single directory case":

folder= FTPTree()

和

site.delete(os.path.join(path, ftpfile.name))

可能的警告

我使用过的服务器在 STOR 和 DELE 命令中的相对路径没有任何问题，因此 site.delete 使用相对路径也可以.如果您的 FTP 服务器需要无路径文件名，您应该首先将 .cwd 到 path 提供的 .delete 普通 ftpfile.name 然后 .cwd 回到基本文件夹.

Possible caveat

The servers I've worked with didn't have any issues with relative paths in the STOR and DELE commands, so site.delete with a relative path worked too. If your FTP server requires pathless filenames, you should first .cwd to the path provided, .delete the plain ftpfile.name and then .cwd back to the base folder.

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