使用python ftplib包递归下载文件夹及文件

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Date    : 2018-06-11 09:35:49
# @Author  : Yaheng Wang (m13262578991@163.com)
# @Link    : http://www.wy2160640.github.io
# @Version : $Id$

import os
import sys
from ftplib import FTP

class FTPSync(object):
    def __init__(self):
        self.conn = FTP('ftp.hapmap.org')
        self.conn.login()
        self.conn.cwd('hapmap/frequencies/')
        os.chdir('/home/ftp.hapmap.org/hapmap/frequencies/')

    def get_dirs_files(self):
        dir_res = []
        self.conn.dir('.', dir_res.append)
        files = [f.split(None, 8)[-1] for f in dir_res if f.startswith('-')]
        dirs = [f.split(None, 8)[-1] for f in dir_res if f.startswith('d')]
        return files, dirs

    def walk(self, next_dir):
        sys.stderr.write('Walking to %s\n'%next_dir)
        self.conn.cwd(next_dir)
        try:
            os.mkdir(next_dir)
        except OSError:
            pass
        os.chdir(next_dir)
        ftp_curr_dir = self.conn.pwd()
        local_curr_dir = os.getcwd()
        files, dirs = self.get_dirs_files()
        sys.stdout.write("FILES: %s"%files)
        sys.stdout.write("DIRS: %s"%dirs)
        for f in files:
            sys.stdout.write("%s : %s"%(next_dir, f))
            sys.stdout.write("download : %s"%os.path.abspath(f))
            outf = open(f, "wb")
            try:
                self.conn.retrbinary("RETR %s"%f, outf.write)
            finally:
                outf.close()
        for d in dirs:
            os.chdir(local_curr_dir)
            self.conn.cwd(ftp_curr_dir)
            self.walk(d)

    def run(self):
        self.walk('.')

def main():
    f = FTPSync()
    f.run()

if __name__ == '__main__':
    main()