dirpath is just a string, so there's no sense in putting it in a list and then iterating over that list.
If you're trying to do something with each file in the tree:
for dir, subdirs, names in os.walk(rootdir):
for name in names:
filepath = os.path.join(dir, name) + "-dummy"
if not os.path.exists(filepath):
f = open(filepath, 'w').write('')
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