试图将文件下载缓冲区拆分为单独的线程

我正在尝试将文件缓冲区下载到5个线程中，但似乎出现乱码。

from numpy import arange
import requests
from threading import Thread
import urllib2

url = 'http://pymotw.com/2/urllib/index.html'
sizeInBytes = r = requests.head(url, headers={'Accept-Encoding': 'identity'}).headers['content-length']

splitBy = 5

splits = arange(splitBy + 1) * (float(sizeInBytes)/splitBy)

dataLst = []

def bufferSplit(url, idx, splits):
    req = urllib2.Request(url,  headers={'Range': 'bytes=%d-%d' % (splits[idx], splits[idx+1])})
    print {'bytes=%d-%d' % (splits[idx], splits[idx+1])}
    dataLst.append(urllib2.urlopen(req).read())


for idx in range(splitBy):
    dlth = Thread(target=bufferSplit, args=(url, idx, splits))
    dlth.start()


print dataLst

with open('page.html', 'w') as fh:
    fh.write(''.join(dataLst))

更新： 所以我努力了，但是进展甚微，但是，如果我下载jpg，则似乎已损坏；

from numpy import arange
import os
import requests
import threading
import urllib2

# url ='http://s1.fans.ge/mp3/201109/08/John_Legend_So_High_Remix(fans_ge).mp3'
url = "http://www.nasa.gov/images/content/607800main_kepler1200_1600-1200.jpg"
# url = 'http://pymotw.com/2/urllib/index.html'
sizeInBytes = requests.head(url, headers={'Accept-Encoding': 'identity'}).headers.get('content-length', None)


splitBy = 5

dataLst = []


class ThreadedFetch(threading.Thread):
    """ docstring for ThreadedFetch
    """
    def __init__(self, url, fileName, splitBy=5):
        super(ThreadedFetch, self).__init__()
        self.__url = url
        self.__spl = splitBy
        self.__dataLst = []
        self.__fileName = fileName

    def run(self):
        if not sizeInBytes:
            print "Size cannot be determined."
            return
        splits = arange(self.__spl + 1) * (float(sizeInBytes)/self.__spl)
        for idx in range(self.__spl):
            req = urllib2.Request(self.__url,  headers={'Range': 'bytes=%d-%d' % (splits[idx], splits[idx+1])})
            self.__dataLst.append(urllib2.urlopen(req).read())


    def getFileData(self):
        return ''.join(self.__dataLst)


fileName = url.split('/')[-1]

dl = ThreadedFetch(url, fileName)
dl.start()
dl.join()
content = dl.getFileData()
if content:
    with open(fileName, 'w') as fh:
        fh.write(content)
    print "Finished Writing file %s" % fileName

以下是下载后的图像。