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import zipfile
import glob

filenames = glob.glob('./*.zip')
with zipfile.ZipFile('output.zip', mode='w') as output:
    for filename in filenames:
    with zipfile.ZipFile(filename) as subZipFile:
        for fn in subZipFile.namelist():
            data = subZipFile.read(fn)
            output.writestr(fn, data)