code: def multipart_etag(digests):
      
      etag = hashlib.md5()
      count = 0
      for dig in digests:
          count += 1
          etag.update(binascii.a2b_hex(dig))
      return '"{}-{}"'.format(etag.hexdigest(), count)
docs: Computes etag for multipart uploads
      :type digests: list of hex-encoded md5 sums (string)
      :param digests: The list of digests for each individual chunk.
  
      :rtype: string
      :returns: The etag computed from the individual chunks.