Python2.7之下载FTP文件

# -*- encoding: utf8 -*-
import os
import sys
import ftplib
import datetime
  
  
  
class FTPSync(object):
    def __init__(self):
        str_today = datetime.date.today()
        self.conn = ftplib.FTP('FTP地址', 'FTP用户名', 'FTP密码')
        self.conn.cwd('远端FTP目录')        # 远端FTP目录
        os.chdir('本地下载目录')                # 本地下载目录
  
    def get_dirs_files(self):
        u''' 得到当前目录和文件, 放入dir_res列表 '''
        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):
        print 'Walking to', 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()
        print "FILES: ", files
        print "DIRS: ", dirs
        for f in files:
            print next_dir, ':', 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():
    origin = sys.stdout
    str_today = datetime.date.today()
    fi = open('log输出文件', 'w')
    sys.stdout = fi
    # ===================================
    print 'Start of program'
    print 'Being processed...'
    f = FTPSync()
    f.run()
    print 'End of program'
    # ===================================
    sys.stdout = origin
    fi.close()
  
if __name__ == '__main__':
    main()