python将ftp指定文件下载到本地指定文件

#!/usr/bin/python
# -*- coding: utf-8 -*-
#zcz
"""
FTP文件下载操作
"""
from ftplib import FTP
import os
class FTP_OP(object):
  def __init__(self, host, username, password, port):
    """
    初始化ftp
  :param host: ftp主机ip
  :param username: ftp用户名
  :param password: ftp密码
  :param port: ftp端口 （默认21）
  """
    self.host = host
    self.username = username
    self.password = password
    self.port = port
  def ftp_connect(self):
    """
    连接ftp
    :return:
    """
    ftp = FTP()
    ftp.set_debuglevel(1) # 不开启调试模式
    ftp.connect(host=self.host, port=self.port) # 连接ftp
    ftp.login(self.username, self.password) # 登录ftp
    ftp.set_pasv(False)##ftp有主动 被动模式 需要调整 
    return ftp
  def download_file(self, ftp_file_path, dst_file_path):
    """
    从ftp下载文件到本地
    :param ftp_file_path: ftp下载文件路径
    :param dst_file_path: 本地存放路径
    :return:
    """
    buffer_size = 204800  #默认是8192
    ftp = self.ftp_connect()
    print(ftp.getwelcome() ) #显示登录ftp信息
    file_list = ftp.nlst(ftp_file_path)
    print(file_list)
    for file_name in file_list:    #循环获取ftp目录下的所有文件
        print("file_name:"+file_name)  #打印出来的文件路径包括了ftp_file_path的/test/1.py  
        ftp_file = os.path.join(ftp_file_path, file_name)   #将文件名和路径拼接
        print("ftp_file:"+ftp_file)
        #write_file = os.path.join(dst_file_path, file_name)
        write_file = dst_file_path
        print("write_file:"+write_file)
        f = open(write_file, "wb")
        ftp.retrbinary('RETR %s'%ftp_file, f.write, buffer_size)
          #f.close()
    ftp.quit()

if __name__ == '__main__':
	host = "127.0.0.1"
  	username = "zcz"
  	password = "xx"
  	port = 21
  	ftp_file_path = "/test/test.xls" #FTP目录
  	dst_file_path = "D://1.xls" #本地目录（
  	ftp = FTP_OP(host=host, username=username, password=password, port=port)
  	ftp.download_file(ftp_file_path=ftp_file_path, dst_file_path=dst_file_path)