如何在python中复制TXT文件中的所有PDF页面？

import os
import shutil
from PyPDF2 import PdfFileReader, PdfFileWriter

def copy_pdf_pages_from_txt(txt_file_path, pdf_file_path, output_file_path):
    # 读取TXT文件中的PDF页面列表
    with open(txt_file_path, 'r') as txt_file:
        pdf_pages = [int(page.strip()) for page in txt_file.readlines()]

    # 打开PDF文件
    with open(pdf_file_path, 'rb') as pdf_file:
        pdf_reader = PdfFileReader(pdf_file)
        pdf_writer = PdfFileWriter()

        # 复制指定页面到新的PDF文件中
        for page_num in pdf_pages:
            page = pdf_reader.getPage(page_num)
            pdf_writer.addPage(page)

        # 保存新的PDF文件
        with open(output_file_path, 'wb') as output_file:
            pdf_writer.write(output_file)

txt_file_path = 'path/to/input.txt'
pdf_file_path = 'path/to/input.pdf'
output_file_path = 'path/to/output.pdf'

copy_pdf_pages_from_txt(txt_file_path, pdf_file_path, output_file_path)