docs: def _extract(filename):
          """Extract package to a temporary folder.
  
          Return:
              pathlib.Path: Temp dir with package contents.
  
          """
          random_string = '{:0d}'.format(randint(0, 10**6))
          tmp = '/tmp/kytos-napp-' + Path(filename).stem + '-' + random_string
          os.mkdir(tmp)
          with tarfile.open(filename, 'r:xz') as tar:
              tar.extractall(tmp)
          return Path(tmp)