code: def compute_checksum(self):
          
          if self._filename.startswith("s3://"):
              print("Warning: Did not perform client-side checksumming for file in S3. To be implemented.")
              pass
          else:
              checksumCalculator = self.ChecksumCalculator(self._filename)
              self._checksums = checksumCalculator.compute()
docs: Calculates checksums for a given file.