Recursive Call Going Elsewhere?

[DeaD_EyE]

This snippet works:

def list_zip(file, filename=None):
    zf = zipfile.ZipFile(file, 'r')
    for cf in zf.filelist:
        print(zf.filename or filename, cf.filename, sep=': ')
        if cf.filename.lower().endswith('.zip'):
            with zf.open(cf.filename, 'r') as new_zf:
                list_zip(io.BytesIO(new_zf.read()), cf.filename)

The argument filename is only used to hand over the recursive call the current name of the open zip file.
The error-handling is your task :-P