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A simple way to ensure all subdirectories exist:

def ensure_dirs_exists(filenames):
subdirs = {os.path.dirname(s) for s in filenames}
subdirs = [ s for s in subdirs if s != '' ]
subdirs.sort(key=len)
for s in subdirs:
        os.mkdir(s)

How about some non ascii string like 'buen día ñoño !'

Oh, ^ looks good.