python下载ftp文件

 

#!/usr/bin/python
import ftplib
host='192.168.1.116'
dir='/printer'
file='S28BW-412110613520.pdf'
username='pub'
passwd='hoolai'
def main():
        f=ftplib.FTP(host)
        try:
                f.set_debuglevel(3)
                f.login(user=username,passwd=passwd)
                f.dir()
                print 'login success'
        except ftplib.error_perm:
                print """ERROR:cannot login"""
                f.quit()
                return
        try:
                f.cwd(dir)
                f.dir()
        except ftplib.error_perm:
                print 'error:cannot to change "%s"'%dir
                f.quit()
                return
                print 'changed to "%s"folder'% dir
        try:
                file_local=open(file,"wb").write
                f.retrbinary('PETR %s'%file,file_local,8192)
                fil_local.close()
        except ftplib.error_perm:
                print 'error:cannot read file "%s"'%file
        f.quit()
        return
if __name__=='__main__':
        main()
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