使用 python 從 ftp 自動下載文件並防止下載文件超過一次

Question

我們有一個 ftp 文件夾，其中包含 700 多個文件（自動從我們的系統生成），文件名如下： ff9a6c2b-4222-4464-a314-dce56efe76cb.txt fffa92f0-9e76-4cce-8933-d256bac90ffa.txt ffbaef37-9d73-41d5-8f23-7ca7c82b3969.txt .. fffa92f0-9e76-4cce-8933-d256bac90ffa.txt我正在嘗試編寫一個腳本來自動下載文件並防止多次下載文件，我的想法是將所有下載的文件名存儲在 xml 文件中（它運行良好）並檢查是否該名稱在下載前存在於 xml 文件中。

問題是即使有 8 個新文件，它也只下載一個。

我的代碼

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

我通過將從 xml 提取的文件名存儲到一個列表中解決了這個問題，如果其他人和我有同樣的問題，這里是下面的代碼

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!")