ftp use pyrhon

ftp2.py

# -*- coding: cp936 -*-
__author__ = 'wenshn902'
import string
from ftplib import FTP
bufsize=1024
def Get(filename):
    command='RETR '+filename
    ftp.retrbinary(command,open(filename,'wb').write,bufsize)
    print 'download successfully'
def Put(filename):
    command='STOR '+filename
    filehandler=open(filename,'rb')
    ftp.storbinary(command,filehandler,bufsize)
    filehandler.close()
    print 'upload successfully'
def PWD():
    print ftp.pwd()
def Size(filename):
    print ftp.size(filename)
def Help():
    print '''
    ==============================
         Simple Python FTP
    ==============================
    cd       enter document
    delete   delete file
    dir      get files list
    get      download file
    help     help
    mkdir    create document
    put      upload file
    pwd      get current path
    rename   rename file name
    rmdir    delete document
    size     get file size
    '''
def main():
    try:
        server=raw_input('enter FTP server info: ')
        ftp=FTP(server)
    except (socket.error, socket.gaierror), e:
        print 'ERROR: cannot reach'
        return
    print '*** Connected to host "%s"' % server

    try:
        username=raw_input('username:')
        password=raw_input('password:')
        ftp.login(username,password)
    except ftplib.error_perm:
        print 'ERROR: cannot login'
        f.quit()
        return
    print '*** Logged in as %s' %username
    print ftp.getwelcome()

    actions={'dir':ftp.dir,'pwd':PWD,'cd':ftp.cwd,'get':Get,
            'put':Put,'help':Help,'rmdir':ftp.rmd,
             'mkdir':ftp.mkd,'delete':ftp.delete,
             'size':Size,'rename':ftp.rename}
    while True:
        print 'pyftp',
        cmds=raw_input('---')
        cmd=string.split(cmds)
        try:
            if len(cmd)==1:
                if string.lower(cmd[0])=='quit':
                    break
                else:
                    actions[string.lower(cmd[0])]()
            elif len(cmd)==2:
                actions[string.lower(cmd[0])](cmd[1])
            elif len(cmd)==3:
                actions[string.lower(cmd[0])](cmd[1],cmd[2])
            else:
                print 'type error'
        except:
            print 'command error'
    ftp.quit()
    return

main()