from PyPDF2 import PdfReader, PdfWriter
file_reader = PdfReader("Rust权威指南.pdf")
for page in range(len(file_reader.pages)):
    if page == 0:
        file_writer = PdfWriter()
        file_writer.add_page(file_reader.pages[page])
        with open("page_{}.pdf".format(page), 'wb') as out:
            file_writer.write(out)

保存pdf文档中的第一页