Create all the empty directories under 'base_dir' needed to put 'files' there. 'base_dir' is just the a name of a directory which doesn't necessarily exist yet; 'files' is a list of filenames to be interpreted relative to 'base_dir'. 'base_dir' + the directory portion of every file
(base_dir, files, mode=0777, verbose=1, dry_run=0)
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