python pdf (PyPDF2模块)-如何拆分/合并？

from PyPDF2 import PdfFileReader, PdfFileWriter

def split_pdf(input_path, output_path, start_page, end_page):
    pdf = PdfFileReader(input_path)
    writer = PdfFileWriter()

    for page_num in range(start_page - 1, end_page):
        writer.addPage(pdf.getPage(page_num))

    with open(output_path, 'wb') as output_file:
        writer.write(output_file)

# 使用示例
split_pdf('input.pdf', 'output.pdf', 1, 3)

from PyPDF2 import PdfFileReader, PdfFileWriter

def merge_pdf(input_paths, output_path):
    writer = PdfFileWriter()

    for path in input_paths:
        pdf = PdfFileReader(path)
        for page_num in range(pdf.getNumPages()):
            writer.addPage(pdf.getPage(page_num))

    with open(output_path, 'wb') as output_file:
        writer.write(output_file)

# 使用示例
merge_pdf(['input1.pdf', 'input2.pdf'], 'output.pdf')