python操作ftp下载文件夹,我执行之后再本地文件夹没有文件或文件夹

#!/usr/bin/python

#coding=gbk

'''''
ftp自动下载、自动上传脚本,可以递归目录操作
'''

from ftplib import FTP

import os,sys,string,datetime,time

import socket

class MYFTP:

def init(self, hostaddr, username, password, remotedir, port=21):

self.hostaddr = hostaddr

self.username = username

self.password = password

self.remotedir = remotedir

self.port = port

self.ftp = FTP()

self.file_list = []

# self.ftp.set_debuglevel(2)

def del(self):

self.ftp.close()

# self.ftp.set_debuglevel(0)

def login(self):

ftp = self.ftp

try:

timeout = 60

socket.setdefaulttimeout(timeout)

ftp.set_pasv(True)

print '开始连接到 %s' %(self.hostaddr)

ftp.connect(self.hostaddr, self.port)

print '成功连接到 %s' %(self.hostaddr)

print '开始登录到 %s' %(self.hostaddr)

ftp.login(self.username, self.password)

print '成功登录到 %s' %(self.hostaddr)

debug_print(ftp.getwelcome())

except Exception:

deal_error("连接或登录失败")

try:

ftp.cwd(self.remotedir)

except(Exception):

deal_error('切换目录失败')

def is_same_size(self, localfile, remotefile):  
    try:  
        remotefile_size = self.ftp.size(remotefile)  
    except:  
        remotefile_size = -1  
    try:  
        localfile_size = os.path.getsize(localfile)  
    except:  
        localfile_size = -1  
    debug_print('lo:%d  re:%d' %(localfile_size, remotefile_size),)  
    if remotefile_size == localfile_size:  
        return 1  
    else:  
        return 0  
def download_file(self, localfile, remotefile):  
    if self.is_same_size(localfile, remotefile):  
        debug_print('%s 文件大小相同,无需下载' %localfile)  
        return  
    else:  
        debug_print('>>>>>>>>>>>>下载文件 %s ... ...' %localfile)  
    return  
    file_handler = open(localfile, 'wb')  
    self.ftp.retrbinary('RETR %s'%(remotefile), file_handler.write)  
    file_handler.close()  

def download_files(self, localdir='./', remotedir='./'):  
    try:  
        self.ftp.cwd(remotedir)  
    except:  
        debug_print('目录%s不存在,继续...' %remotedir)  
        return  
    if not os.path.isdir(localdir):  
        os.makedirs(localdir)  
    debug_print('切换至目录 %s' %self.ftp.pwd())  
    self.file_list = []  
    self.ftp.dir(self.get_file_list)  
    remotenames = self.file_list  
    #print(remotenames)  
    #return  
    for item in remotenames:  
        filetype = item[0]  
        filename = item[1]  
        local = os.path.join(localdir, filename)  
        if filetype == 'd':  
            self.download_files(local, filename)  
        elif filetype == '-':  
            self.download_file(local, filename)  
    self.ftp.cwd('..')  
    debug_print('返回上层目录 %s' %self.ftp.pwd())  
def upload_file(self, localfile, remotefile):  
    if not os.path.isfile(localfile):  
        return  
    if self.is_same_size(localfile, remotefile):  
        debug_print('跳过[相等]: %s' %localfile)  
        return  
    file_handler = open(localfile, 'rb')  
    self.ftp.storbinary('STOR %s' %remotefile, file_handler)  
    file_handler.close()  
    debug_print('已传送: %s' %localfile)  
def upload_files(self, localdir='./', remotedir = './'):  
    if not os.path.isdir(localdir):  
        return  
    localnames = os.listdir(localdir)  
    self.ftp.cwd(remotedir)  
    for item in localnames:  
        src = os.path.join(localdir, item)  
        if os.path.isdir(src):  
            try:  
                self.ftp.mkd(item)  
            except:  
                debug_print('目录已存在 %s' %item)  
            self.upload_files(src, item)  
        else:  
            self.upload_file(src, item)  
    self.ftp.cwd('..')  

def get_file_list(self, line):  
    ret_arr = []  
    file_arr = self.get_filename(line)  
    if file_arr[1] not in ['.', '..']:  
        self.file_list.append(file_arr)  

def get_filename(self, line):  
    pos = line.rfind(':')  
    while(line[pos] != ' '):  
        pos += 1  
    while(line[pos] == ' '):  
        pos += 1  
    file_arr = [line[0], line[pos:]]  
    return file_arr  

def debug_print(s):

print (s)

def deal_error(e):

timenow = time.localtime()

datenow = time.strftime('%Y-%m-%d', timenow)

logstr = '%s 发生错误: %s' %(datenow, e)

debug_print(logstr)

file.write(logstr)

sys.exit()

if name == '__main__':

file = open("log.txt", "a")

timenow = time.localtime()

datenow = time.strftime('%Y-%m-%d', timenow)

logstr = datenow

# 配置如下变量

hostaddr = '169.254.175.128' # ftp地址

username = 'dev' # 用户名

password = 'dfhh2016' # 密码

port = 21 # 端口号

rootdir_local = 'C:\Users\126\Desktop\新建文件夹 (4)\新建文件夹' # 本地目录

rootdir_remote = '/1111' # 远程目录

f = MYFTP(hostaddr, username, password, rootdir_remote, port)  
f.login()  
f.download_files(rootdir_local, rootdir_remote)  

timenow  = time.localtime()  
datenow  = time.strftime('%Y-%m-%d', timenow)  
logstr += " - %s 成功执行了备份\n" %datenow  
debug_print(logstr)  

file.write(logstr)  
file.close()  



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