os.walk(), traverse dirs and sub-dirs

import os
 
rootDir = '/home/kracht/Misc/IVP/fiotest_00794'
for dirName, subDirs, files in os.walk(rootDir):
    print('Directory: %s' % dirName)
    print('subDirs: %s' % str( subDirs))
    for fname in files:
        print('  %s' % fname)