Method _calculate_checksum

barcode/codex.py:249–253

(self, encoded: list[int])

        return encoded

    def _calculate_checksum(self, encoded: list[int]) -> int:
        cs = [encoded[0]]
        for i, code_num in enumerate(encoded[1:], start=1):
            cs.append(i * code_num)
        return sum(cs) % 103

    def _build(self) -> list[int]:
        encoded: list[int] = [code128.START_CODES[self._charset]]