通过pypdf在pdf文件上读/写xmp metadatas

pip install pypdf2

import PyPDF2

# 打开PDF文件
with open('example.pdf', 'rb') as file:
    # 创建PDF阅读器对象
    pdf_reader = PyPDF2.PdfFileReader(file)
    # 获取PDF文件中的XMP元数据
    xmp_metadata = pdf_reader.getXmpMetadata()
    print(xmp_metadata)

    # 创建PDF写入器对象
    pdf_writer = PyPDF2.PdfFileWriter()
    # 将PDF阅读器对象中的页面添加到写入器对象中
    for page_num in range(pdf_reader.numPages):
        page = pdf_reader.getPage(page_num)
        pdf_writer.addPage(page)

    # 将新的XMP元数据写入PDF文件
    pdf_writer.addMetadata({'/Title': 'New Title', '/Subject': 'New Subject'})

    # 保存PDF文件
    with open('new_example.pdf', 'wb') as new_file:
        pdf_writer.write(new_file)