【PDF拆分 Python拆分左右并排PDF】

✅ 输入：左右并排的 PDF（一页 = 左页 + 右页）

✅ 输出：单页 PDF（左页、右页各一页）

✅ 跳过：第 1 页,最后 1 页

✅ 保持原始页面比例、分辨率

pip install pypdf

from pypdf import PdfReader, PdfWriter
from copy import deepcopy
from tqdm import tqdm


def split_left_right_pdf(
    input_pdf: str,
    output_pdf: str,
    skip_first: bool = True,
    skip_last: bool = True,
):
    reader = PdfReader(input_pdf)
    writer = PdfWriter()

    total_pages = len(reader.pages)

    for i in tqdm(range(0, total_pages), total=total_pages):
        page = reader.pages[i]
        if skip_first and i == 0:
            writer.add_page(page)
            continue
        if skip_last and i == total_pages - 1:
            writer.add_page(page)
            continue

        media_box = page.mediabox
        width = float(media_box.width)
        height = float(media_box.height)

        half_width = width / 2

        # 左页
        left_page = deepcopy(page)
        left_page.mediabox.lower_left = (0, 0)
        left_page.mediabox.upper_right = (half_width, height)
        writer.add_page(left_page)

        # 右页
        right_page = deepcopy(page)
        right_page.mediabox.lower_left = (half_width, 0)
        right_page.mediabox.upper_right = (width, height)
        writer.add_page(right_page)

    with open(output_pdf, "wb") as f:
        writer.write(f)


if __name__ == "__main__":
    split_left_right_pdf(
        input_pdf=r"科学智能白皮书2025.pdf",
        output_pdf=r"科学智能白皮书2025-single.pdf",
        skip_first=True,
        skip_last=True,
    )