python访问ftp站点，下载文件

python访问ftp站点，下载文件。

#!/usr/bin/python  
# -*- coding: utf-8 -*-  
import ftplib  
import os  
import socket  
import sys
  
HOST = '10.17.25.42'  
DIRN = 'file_yes'  
FILE = 'wordless10m.docx' 
FILE1 = 'ftp1.py' 
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('FTP002','￥￥￥￥￥￥￥￥')
    except ftplib.error_perm:  
        print 'ERROR: cannot login FTP'  
        f.quit()  
        return  
    #print f.getwelcome()
    print '*** Logged in as FTP002'  
    
    
    
    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:  
        f.dir()  
    except ftplib.error_perm:  
        print 'ERRORL list "%s" info' % DIRN  
        f.quit()  
        return  
    print '*** This is "%s" folder info' % DIRN  
    
    
    try: 
        buf_size = 1024
        os.chdir("c:/share/")
        f.retrbinary('RETR %s' %FILE, open(FILE, 'wb').write,buf_size)  
        #f.retrbinary('RETR wordless10m.docx', open(FILE, 'wb').write,buf_size)  
    except ftplib.error_perm:  
        print 'ERROR: cannot read file "%s"' % FILE  
        os.unlink(FILE)  #delete FILE
    else:  
        print '*** Downloaded "%s" to CWD' % FILE

    f.quit()  
    return  
  
if __name__ == '__main__':  
    main()