使用python从ftp自动下载文件，并防止多次下载文件

Question

我们有一个ftp文件夹，其中包含700多个文件（generetad由我们的系统自动生成）文件名如：ff9a6c2b-4222-4464-a314-dce56efe76cb.txt ..ffbaef37-9d73-41d5-8f23-7ca7c82b3969.txt..fffa92f0-9e76-4cce-8933-d256bac90ffa.txt我正在尝试编写一个脚本来自动下载文件，并防止多次下载文件，我的想法是将所有下载的文件名存储在xml文件中（效果很好），并在下载前检查该名称是否存在于xml文件中。

问题是即使有8个新文件，它也只能下载一个。

我的代码

import ftputil 
from subprocess import Popen 
import ftplib
import os
import os.path
import xml.etree.cElementTree as ET



server = 'ip_adress'
user = 'user'
password = 'Passwd'


ftp = ftplib.FTP(server)
ftp.login(user, password)

files = []
root = ET.Element("files")

file_exists = os.path.isfile("filename.xml") 

if file_exists:
   f = ET.parse("filename-Copie.xml")
   root = f.getroot()
   files = ftp.nlst()
   for file in files:
       for item in root:
           if file != item.text :
               #print ("the file name: ",item.text, " already exist")  
                ftp_host = ftputil.FTPHost(server, user, password)
                ftp_host.download(file, file)
                ET.SubElement(root, "file", name="filename").text = file

   tree = ET.ElementTree(root)
   tree.write("filename.xml")
   p = Popen("move.bat", cwd=r"C:\\Users\\Sas\\Desktop\\ftpdown\\") 
   stdout, stderr = p.communicate()
   print("Finished!") 

else:
   f = open("filename.xml", "w")
   with ftputil.FTPHost(server, user, password) as ftp_host: 

        files = ftp_host.listdir(ftp_host.curdir)
        root = ET.Element("files")
        for file in files:
            if ftp_host.path.isfile(file):
               ftp_host.download(file, file)
               ET.SubElement(root, "file", name="filename").text = file
   tree = ET.ElementTree(root)
   tree.write("filename.xml")
   p = Popen("move.bat", cwd=r"C:\\Users\\Sas\\Desktop\\ftpdown\\") 

   stdout, stderr = p.communicate() 
print("Finished!") 

Answer 1

我通过将从xml提取的文件名存储到列表中解决了问题这是下面的代码，如果有人和我有同样的问题]

import ftputil 
from subprocess import Popen 
import ftplib
import os
import os.path
import xml.etree.cElementTree as ET



server = 'ip-adress'
user = 'user'
password = 'Passwd'


ftp = ftplib.FTP(server)
ftp.login(user, password)

files = []
root = ET.Element("files")

file_exists = os.path.isfile("filename.xml") 

if file_exists:
   f = ET.parse("filename-Copie.xml")
   root = f.getroot()
   files = ftp.nlst()
   oldfile = []
   for child in root:
       oldfile.append(child.text)

   for file in files:
           if file not in oldfile: 
                ftp_host = ftputil.FTPHost(server, user, password)
                ftp_host.download(file, file)
                ET.SubElement(root, "file", name="filename").text = file

   tree = ET.ElementTree(root)
   tree.write("filename.xml")
   p = Popen("move.bat", cwd=r"C:\\Users\\Sas\\Desktop\\ftpdown\\") 
   stdout, stderr = p.communicate()
   print("Finished!") 

else:
   f = open("filename.xml", "w")
   with ftputil.FTPHost(server, user, password) as ftp_host: 

        files = ftp_host.listdir(ftp_host.curdir)
        root = ET.Element("files")
        for file in files:
            if ftp_host.path.isfile(file):
               ftp_host.download(file, file)
               ET.SubElement(root, "file", name="filename").text = file
   tree = ET.ElementTree(root)
   tree.write("filename.xml")
   p = Popen("move.bat", cwd=r"C:\\Users\\Sas\\Desktop\\ftpdown\\") 

   stdout, stderr = p.communicate() 
print("Finished!")