docs: def init_storage():
      """
      Initialize the local dictionnaries cache in ~/.crosswords/dicts.
      """
      # http://stackoverflow.com/a/600612/735926
      try:
          os.makedirs(DICTS_PATH)
      except OSError as ex:
          if ex.errno != errno.EEXIST or not os.path.isdir(DICTS_PATH):
              raise