def create_tree_folders(folderName):
 if os.path.exists(folderName):
  raise NinjaIOException(u'The folder already exist')
 os.makedirs(folderName)

def create_tree_folders ( folderName ) : if os . path . exists ( folderName ) : raise NinjaIOException ( u'The folder already exist' ) os . makedirs ( folderName )
create a group of folders .