FTPディレクトリ全体をダウンロードするPythonメソッド

#!/usr/bin/evn python
 
from ftplib import FTP_TLS, FTP
import socket
import ssl
import os
import sys
 
class IMPLICIT_FTP_TLS(FTP_TLS):
 #构造函数初始化父类
 def __init__(self, host='', user='', passwd='', acct='', keyfile=None,
  certfile=None, timeout=60):
  FTP_TLS.__init__(self, host, user, passwd, acct, keyfile, certfile, timeout)
 #建立服务器的FTPS连接
 def connect(self, host='', port=0, timeout=-999):
  if host != '':
   self.host = host
  if port > 0:
   self.port = port
  if timeout != -999:
   self.timeout = timeout
  try:
   #创建socket
   self.sock = socket.create_connection((self.host, self.port), self.timeout)
   self.af = self.sock.family
   #wrap_socket接收一个socket实例,返回SSLSocket实例，可以理解在普通socket上封装了一层ssl
   self.sock = ssl.wrap_socket(self.sock, self.keyfile, self.certfile)
   self.file = self.sock.makefile('rb')
   self.welcome = self.getresp()
  except Exception as e:
   print (e)
  return self.welcome
 
 
def get_ftp_ver(version):
 #如果没有这个目录就新建
 if not os.path.isdir(version):
  os.makedirs(version)
 ftps = IMPLICIT_FTP_TLS()
 ftps.connect(host='10.0.0.8', port=666)
 ftps.login(user="ftp_user", passwd="ftp_password")
 #建立安全的数据连接，之后才能返回数据。
 ftps.prot_p()
 ftps.cwd(version)
 files = ftps.nlst()
 #进入本地目录
 os.chdir(version)
 #循环下载每个文件
 for file in files:
  fp = open(file, 'wb')
  ftps.retrbinary('RETR %s' % file, fp.write)
 ftps.close()
 
if __name__ == '__main__':
 get_ftp_ver(sys.argv[1])

#python get_data.py version_20160920