python访问ftp站点——切换访问模式

python访问ftp站点——切换访问模式。

在一个控制连接下，切换主动模式和被动模式访问ftp站点。

#!/usr/bin/python  
# -*- coding: utf-8 -*-  
import ftplib  
import os  
import socket  
import sys
  
HOST = '10.15.26.51'  
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.set_pasv(1)#pasv mode
    except ftplib.error_perm:
        print "cannot changed mode"
        f.quit()
        return
    #print "***active mode"
    print "***pasv mode"


    
    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

    try:
        f.set_pasv(0)#active mode
    except ftplib.error_perm:
        print "cannot changed mode"
        f.quit()
        return
    print "***active mode"
    #print "***pasv mode"

     
    
    try: 
        buf_size = 1024
        #f.retrbinary('RETR %s' %FILE, open(FILE, 'wb').write,buf_size)  
        f.storbinary('stor %s'%FILE1, open(FILE1, 'rb'),buf_size)
    except ftplib.error_perm:
        print 'ERROR: cannot read file "%s"' % FILE1
        #os.unlink(FILE1)  #delete FILE
    else:
        print '*** Uploaded "%s" to CWD' % FILE1
    try:
        f.dir()
    except ftplib.error_perm:
        print 'ERRORL list "%s" info' % DIRN
        f.quit()
        return
    print '*** This is "%s" folder info' % DIRN
    f.quit()  
    return  
  
if __name__ == '__main__':  
    main()