python多线程爬取文件，怎么设置超时重连。

Question

在用python爬取数据时，单进程里开启多线程抓取，毕竟IO密集我就没搞多进程了。

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代码如下

    def get_downloads_url_list(self,pageNum):
        FilePath='C:/RMDZY/h'+str(pageNum)
        os.chdir(FilePath)
        with open(FilePath+'/m3u8.txt', 'r') as f:
            m3u8_txt = f.read()
        download_ts_list = re.findall(r'ppvod' + r'd{7}' + r'.ts', m3u8_txt)
        download_url_list = [url + str(pageNum) + '/1000kb/hls/' + download_ts_list[i] for i in
                             range(len(download_ts_list))]
        max_length=len(download_url_list)
        dat_list=['ts'+str(i)+'.ts' for i in range(max_length)]
        dat_str='+'.join(dat_list)
        ts_command='copy /b '+dat_str+' new.ts'
        with open('ts.bat','w') as f:
            f.write(ts_command)
        return download_url_list

    def download_by_m3u8(self,i,pageNum):
        download_list=self.get_downloads_url_list(pageNum)
        ts_file = requests.get(download_list[i], verify=False)
        with open('ts'+str(i)+'.ts','ab') as f:
            f.write(ts_file.content)![图片描述][1]

    def download_threading(self,pageNum):
        download_list=self.get_downloads_url_list(pageNum)
        thread_list=[]
        for i in range(len(download_list)):
            thread = threading.Thread(target=self.download_by_m3u8, args=[i,pageNum])
            thread_list.append(thread)
            thread.start()
        for thread in thread_list:
            thread.join()

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但是只要一个线程的requests没有返回值，线程就会一直等待，也不会写入，所以会出现，主进程一直没阻塞的问题。
如图

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请问怎么处理，比如，给requests.get设置一个timeout，但是超过之后怎么处理啊，我设置了timeout之后，好像线程直接被kill了，可以继续下载下一个目标，但是，这个没下载的我这么记录啊，能不能捕获这个异常然后重连啊。主要还是写法，不太会。生疏啊

Answer 1

num = 3 # 重试次数
while num > 0:
    try:
        result = requests.get(..., timeout=3) 
    except requests.exceptions.ReadTimeout:
        print 'Timeout, try again'
        num -= 1
    else:
        # 成功获取
        print 'ok'
        print result
        break
else:
    # 3次都失败
    print 'Try 3 times, But all failed'