PDFしおり(栞・bookmark)書出・書込

下版pdfを１ファイルに結合し、栞を追加する作業はよくあります。この際、ノンブルとタイトルとその階層情報あれば、pyMupdfライブラリで、簡単にできます！

import fitz
import openpyxl


def export_pdf_bookmark_to_excel(pdf_file, excel_format):
    # 既存の栞を取得（今後の改訂編集に流用データになる）
    doc = fitz.open(pdf_file)
    bookmark = doc.get_toc()  # [[level, title, page_num], ...]
    doc.close()
    #
    wb = openpyxl.load_workbook(excel_format)
    ws = wb.active
    # from 3rd row
    for i, x in enumerate(bookmark):
        ws.cell(i + 3, 1).value = x[2]  # page_num
        ws.cell(i + 3, x[0] + 1).value = x[1]
    wb.save(excel_format.replace(".xlsx", "_new.xlsx"))


def import_bookmark_from_excel_to_pdf(excel_file, pdf_file):
    # 規定のエクセルから栞を取得してPDFに設定
    bookmark = []
    wb = openpyxl.load_workbook(excel_file, read_only=True)
    ws = wb.active
    max_row = ws.max_row
    start_row = 3
    for i in range(start_row, max_row + 1):
        page_num = int(ws.cell(i, 1).value)  # A列
        for c in range(2, 12):  # NOTE: B-K列
            title = ws.cell(i, c).value
            if title is not None:
                level = c - 1
                bookmark.append([level, title, page_num])
                break
    wb.close()
    #
    doc = fitz.open(pdf_file)
    doc.set_toc(bookmark)
    doc.save(pdf_file.replace(".pdf", "_new.pdf"))


# https://media.readthedocs.org/pdf/xlwings/stable/xlwings.pdf
pdf_file_with_bookmark = "docs-xlwings-org-en-stable.pdf"
excel_format = "bookmark.xlsx"
export_pdf_bookmark_to_excel(pdf_file_with_bookmark, excel_format)
#
pdf_file_blank = "blank.pdf"  # しおりなし
excel_with_bookmark = "bookmark_new.xlsx"
import_bookmark_from_excel_to_pdf(excel_with_bookmark, pdf_file_blank)