下载并解压缩 .zip 文件，而无需写入磁盘。

我已经成功编写了我的第一个Python脚本，可以从URL下载一个ZIP文件列表，然后解压缩这些ZIP文件并将它们写入磁盘。

现在我不知道如何实现下一步。

我的主要目标是下载和提取zip文件，并通过TCP流传递其内容（CSV数据）。如果可以避免这样做，我宁愿不实际将任何zip或提取的文件写入磁盘。

这是我的当前脚本，它可以工作，但不幸的是必须将文件写入磁盘。

import urllib, urllister
import zipfile
import urllib2
import os
import time
import pickle
# check for extraction directories existence
if not os.path.isdir('downloaded'):
    os.makedirs('downloaded')
if not os.path.isdir('extracted'):
    os.makedirs('extracted')
# open logfile for downloaded data and save to local variable
if os.path.isfile('downloaded.pickle'):
    downloadedLog = pickle.load(open('downloaded.pickle'))
else:
    downloadedLog = {'key':'value'}
# remove entries older than 5 days (to maintain speed)
# path of zip files
zipFileURL = "http://www.thewebserver.com/that/contains/a/directory/of/zip/files"
# retrieve list of URLs from the webservers
usock = urllib.urlopen(zipFileURL)
parser = urllister.URLLister()
parser.feed(usock.read())
usock.close()
parser.close()
# only parse urls
for url in parser.urls: 
    if "PUBLIC_P5MIN" in url:
        # download the file
        downloadURL = zipFileURL + url
        outputFilename = "downloaded/" + url
        # check if file already exists on disk
        if url in downloadedLog or os.path.isfile(outputFilename):
            print "Skipping " + downloadURL
            continue
        print "Downloading ",downloadURL
        response = urllib2.urlopen(downloadURL)
        zippedData = response.read()
        # save data to disk
        print "Saving to ",outputFilename
        output = open(outputFilename,'wb')
        output.write(zippedData)
        output.close()
        # extract the data
        zfobj = zipfile.ZipFile(outputFilename)
        for name in zfobj.namelist():
            uncompressed = zfobj.read(name)
            # save uncompressed data to disk
            outputFilename = "extracted/" + name
            print "Saving extracted file to ",outputFilename
            output = open(outputFilename,'wb')
            output.write(uncompressed)
            output.close()
            # send data via tcp stream
            # file successfully downloaded and extracted store into local log and filesystem log
            downloadedLog[url] = time.time();
            pickle.dump(downloadedLog, open('downloaded.pickle', "wb" ))