python实现简单ftp客户端的方法

本文实例讲述了python实现简单ftp客户端的方法。分享给大家供大家参考。具体实现方法如下：

#!/usr/bin/python
# -*- coding: utf-8 -*-
import ftplib
import os
import socket
HOST = 'ftp.mozilla.org'
DIRN = 'pub/mozilla.org/webtools'
FILE = 'bugzilla-3.6.9-to-3.6.10-nodocs.diff.gz'
def writedata(data):
 f = open(FILE,'wb')
 try:
   f.write(data)
 finally:
   f.close()
def main():
 try:
   f = ftplib.FTP(HOST)
 except (socket.error, socket.gaierror):
   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 "anonymously"'
 try:
   f.cwd(DIRN)
 except ftplib.error_perm:
   print 'ERRORL cannot CD to "％s"' ％ DIRN
   f.quit()
   return
 print '*** Changed to "％s" folder' ％ DIRN
 try:
   #传一个回调函数给retrbinary() 它在每接收一个二进制数据时都会被调用
   f.retrbinary('RETR ％s' ％FILE, writedata)
 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()

希望本文所述对大家的Python程序设计有所帮助。