import os, zipfile

filenamein = 'jython-complete.jar'

zipin = zipfile.ZipFile(filenamein, 'r')
filelist = zipin.infolist()

uniquefiles = {}
duplicates = []

for f in filelist:
    if f.filename not in uniquefiles:
        uniquefiles[f.filename] = f
    else:
        duplicates.append(f)

if duplicates:
    print '%d duplicates have been found in %s' % (len(duplicates), filenamein)
    print "\n".join([f.filename for f in duplicates])

    filenameout = "-unique".join(os.path.splitext(filenamein))
    print 'Creating unique archive %s...' % filenameout

    zipout = zipfile.ZipFile(filenameout, 'w')
    writtenfiles = {}
    for f in filelist:
        if f.filename not in writtenfiles:
            zipout.writestr(f, zipin.read(f.filename))
            writtenfiles[f.filename] = f
    zipout.close()
else:
    print 'No duplicates have been found in ' % filenamein

zipin.close()