code: def parse_checksum_file(self, file):
          
          checksums = dict()
          file_path = '/'.join((self.rawdir, file))
          with open(file_path, 'rt') as tsvfile:
              reader = csv.reader(tsvfile, delimiter=' ')
              for row in reader:
                  (checksum, whitespace, file_name) = row
                  checksums[checksum] = file_name
  
          return checksums
docs: :param file
          :return dict