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WPS能拆分合并，但却是要输入编辑密码，我没有。故写了个脚本来做拆分，顺便附上合并的代码。

代码如下（extract.py)

#!/usr/bin/env python
"""PDF拆分脚本(需要Python3.10+)Usage::$ python extract.py <pdf-file>
"""
import os
import sys
from pathlib import Path# pip install PyMuPDF
import fitz  # type:ignore[import-untyped]SRC_FILE = Path.home() / "Downloads" / "yasi.pdf"def new_one(pdf: fitz.Document, page_num: int, parent: Path | None = None) -> Path:target = Path(f"{page_num}.pdf")if parent is not None:target = parent / target.namenew_pdf = fitz.Document()# 用第page_num页生成新的PDF文件index = page_num - 1new_pdf.insert_pdf(pdf, from_page=index, to_page=index)new_pdf.save(target)return targetdef extract(file: Path,num: int | None = None,
) -> Path:"""拆分PDF:param file: 文件路径:param num: 要拆分出哪一页，如果传None或不传，则每一页都拆分出来"""with fitz.open(file) as f:if num is None:folder = Path(file.stem)if not folder.exists():print(f"Directory {folder} created!")folder.mkdir()print(f"Total pages of {file} is {f.page_count}.")for num in range(1, f.page_count + 1):new_one(f, num, folder)return folderelse:return new_one(f, num)def main() -> None:file = SRC_FILEpage_num: int | None = Noneif sys.argv[1:]:if (a := sys.argv[1]).isdigit():page_num = int(a)elif (_p := Path(a)).is_file():file = _pif sys.argv[2:] and sys.argv[2].isdigit():page_num = int(sys.argv[2])elif _p.suffix.lower() == ".pdf":print(f"文件`{_p}`不存在！")elif not file.exists():while True:a = input("请输入要拆分的PDF文件路径：").strip()if "~" in a:a = os.path.expanduser(a)if (_p := Path(a)).is_file():file = _pbreakelse:print(f"文件{_p}不存在，请重新输入。\n")dst = extract(file, page_num)if dst.is_file():print(f"Save file to {dst}")else:print(f"Save files to {dst}{os.sep}")if __name__ == "__main__":  # pragma: no covermain()

合并的代码如下：

from pathlib import Pathimport fitzdef merge(*files: str, new_name: str | None = None, verbose=True) -> Path:ps = [Path(i) for i in files]if new_name is None:new_name = '_'.join(i.stem for i in ps) + '.pdf'target = Path(new_name)new_pdf = fitz.Document()for p in ps:with fitz.open(p) as f:new_pdf.insert_pdf(f)new_pdf.save(target)if verbose:print(f'Save file to {target}')return targetmerge('1.pdf', '2.pdf')