Unzip nested zip files in python

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ZipFile needs a file-like object, so you can use StringIO to turn the data you read from the nested zip into such an object. The caveat is that you’ll be loading the full (still compressed) inner zip into memory.

with zipfile.ZipFile('foo.zip') as z:
    with z.open('nested.zip') as z2:
        z2_filedata = cStringIO.StringIO(z2.read())
        with zipfile.ZipFile(z2_filedata) as nested_zip:
            print nested_zip.open('data.txt').read()

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