Python ftplib 模块关于 ftp的下载

import  ftplib
import  os
import  socket
import  sys

HOST=‘192.168.216.193‘
DIRN=‘c:\\ftp\FTP.123‘
FILE=‘FTP.123‘
USER_NAME=‘123‘
PWD=‘123‘
def    Downloadfile(file_name):
   try:

      f=ftplib.FTP(HOST)
   except(sockt.error, socket.gaierror)  as  e:
       print (‘error:  cannot  reach %s‘ % HOST)
       return
   
   print (‘**** connected  to host  %s‘ % HOST) 
         
   try:
       f.login(USER_NAME,PWD)
   except ftplib.error_perm:
       print(‘ERROR:cannot  login  USER_NAME=%s,PWD=%s‘%(USER_NAME,PWD))
       f.quit()
       return
   print(‘***  logined  in as  %s ‘ % USER_name)
   try:
      f.cwd(DIRN)
   except  ftplib.error_perm:
       print (‘error :cannot  cd  to %s‘% RIRN)
       f.quit()
       return
    try:
        file=open(file_name, ‘wb‘)
        f.retrbinary(‘RETR %s‘ %file_name,file.write)
        file.close()
    except ftplib.error_perm:
        print(‘error !!‘)
        os.unlink(filename)
        file.close()
    else:    
        print  (‘**** downloaded  %s to %s‘%(file_name ,os.getcwd()))
    f.quit
    return

Downloadfile(123.txt)

> import ftplib
>>> f=ftplib.FTP(‘192.168.216.193‘)
   
>>> f=ftplib.FTP(‘192.168.216.193‘)
>>> f.login(‘123‘,‘123‘)
‘230 User successfully logged in.‘
>>> f.cwd(‘FTP.123‘)
‘250 "/ftp.123" is current directory.‘
>>> f.retrbinary(‘RETR 123.txt‘,open(‘c:\\123.txt‘,‘wb‘).write)
‘226 Transfer complete‘

#!/usr/bin/env python 
# -*- coding: utf-8 -*- 
from ftplib import FTP 
def ftp_up(filename = "20120904.rar"): 
  ftp=FTP() 
  ftp.set_debuglevel(2)
  #打开调试级别2，显示详细信息;0为关闭调试信息 
  ftp.connect(‘192.168.0.1‘,‘21‘)
  #连接 
  ftp.login(‘admin‘,‘admin‘)
  #登录，如果匿名登录则用空串代替即可 
  #print ftp.getwelcome()
  #显示ftp服务器欢迎信息 
  #ftp.cwd(‘xxx/xxx/‘)
  #选择操作目录 
  bufsize = 1024
  #设置缓冲块大小 
  file_handler = open(filename,‘rb‘)
  #以读模式在本地打开文件 
  ftp.storbinary(‘STOR %s‘ % os.path.basename(filename),file_handler,bufsize)
  #上传文件 
  ftp.set_debuglevel(0) 
  file_handler.close() 
  ftp.quit() 
  print "ftp up OK"
def ftp_down(filename = "20120904.rar"): 
  ftp=FTP() 
  ftp.set_debuglevel(2) 
  ftp.connect(‘192.168.0.1‘,‘21‘) 
  ftp.login(‘admin‘,‘admin‘) 
  #print ftp.getwelcome()
  #显示ftp服务器欢迎信息 
  #ftp.cwd(‘xxx/xxx/‘)
  #选择操作目录 
  bufsize = 1024
  filename = "20120904.rar"
  file_handler = open(filename,‘wb‘).write
  #以写模式在本地打开文件 
  ftp.retrbinary(‘RETR %s‘ % os.path.basename(filename),file_handler,bufsize)
  #接收服务器上文件并写入本地文件 
  ftp.set_debuglevel(0) 
  file_handler.close() 
  ftp.quit() 
  print "ftp down OK