Python ftplib，通过ftp获取最新文件

Question

我知道如何设置下载这样的文件，但大多数文件都没有命名为 file-LATEST。我怎样才能下载最新的文件？

通过:

• 修改日期
• 时间戳
• if version.current < version.new then download

这是我目前所拥有的:

#!/usr/bin/env python

import ftplib
import os
import socket

HOST = 'ftp.site.org'
DIRN = 'dir/'
FILE = 'filename-LATEST.tar.gz'

def main():
    try:
    f = ftplib.FTP(HOST)
except (socket.error, socket.gaierror), e:
    print 'ERROR: cannot reach "%s"' % HOST
    return
print '*** Connected to host "%s"' % HOST

try:
    f.login()
except ftplib.error_perm:
    print 'ERROR:: cannot login anonymously'
    f.quit()
    return
print '*** Logged in as "anonymous"'

try:
    f.cwd(DIRN)
except ftplib.error_perm:
    print 'ERROR: cannot CD to "%s"' % DIRN
    f.quit()
    return
print '*** Changed to "%s" folder' % DIRN

try:
    f.retrbinary('RETR %s' % FILE, open(FILE, 'wb').write)
except ftplib.error_perm:
    print 'ERROR: cannot read file "%s"' % FILE
    os.unlink(FILE)
else:
    print '*** Downloaded "%s" to CWD' % FILE
f.quit()
return

if __name__ == '__main__':
main()

Answer 1

你必须像 ftplib 的文档那样执行 ftp.retrlines('LIST',callback) 并解析结果