test_zip.py

import zipfile, time
import cStringIO as StringIO

data = StringIO.StringIO()
req = open("archive.zip@ref=master", "rb")
while True:
    buff = req.read(1024)
    if not buff:
        break
    data.write(buff)
    data.seek(0)
    try:
        zipdata = zipfile.ZipFile(data)
        print ".",
    except Exception, err:
        print "-",
    data.seek(0, 2)

s = time.time()
zipdata = zipfile.ZipFile(data)
print time.time() - s
print zipdata.testzip()
print time.time() - s