# -*- coding: utf-8 -*-

from ftplib import FTP

ftp = FTP('ftp_url')
ftp.login()

flist = ftp.nlst('pub/Books')

for obj in flist:
    print obj

ftps.retrlines('LIST')

total 9
drwxr-xr-x   8 root     wheel        1024 Jan  3  1994 .
drwxr-xr-x   8 root     wheel        1024 Jan  3  1994 ..
drwxr-xr-x   2 root     wheel        1024 Jan  3  1994 bin
drwxr-xr-x   2 root     wheel        1024 Jan  3  1994 etc
d-wxrwxr-x   2 ftp      wheel        1024 Sep  5 13:43 incoming
drwxr-xr-x   2 root     wheel        1024 Nov 17  1993 lib
drwxr-xr-x   6 1094     wheel        1024 Sep 13 19:07 pub
drwxr-xr-x   3 root     wheel        1024 Jan  3  1994 usr
-rw-r--r--   1 root     root          312 Aug  1  1994 welcome.msg
'226 Transfer complete.'

if (файл):
    действие
else:
    действие

import os

if (os.path.isfile('ftp://myftp/pub/test.txt')):
    print '1'
else:
    print '0'