code: def ImportFile(store, filename, start):
    
    with io.open(filename, "r") as fp:
      reader = csv.Reader(fp.read())
      i = 0
      current_row = None
      product_code_list = []
      op_system_code_list = []
      for row in reader:
        # Skip first row.
        i += 1
        if i and i % 5000 == 0:
          data_store.DB.Flush()
          print("Imported %d hashes" % i)
        if i > 1:
          if len(row) != 8:
            continue
          try:
            if i < start:
              continue
            if current_row:
              if current_row[0] == row[0]:
                # Same hash, add product/system
                product_code_list.append(int(row[5]))
                op_system_code_list.append(row[6])
                continue
              # Fall through and add current row.
            else:
              # First row.
              current_row = row
              product_code_list = [int(row[5])]
              op_system_code_list = [row[6]]
              continue
            _ImportRow(store, current_row, product_code_list, op_system_code_list)
            # Set new hash.
            current_row = row
            product_code_list = [int(row[5])]
            op_system_code_list = [row[6]]
          except Exception as e:  # pylint: disable=broad-except
            print("Failed at %d with %s" % (i, str(e)))
            return i - 1
      if current_row:
        _ImportRow(store, current_row, product_code_list, op_system_code_list)
      return i
docs: Import hashes from 'filename' into 'store'.