利用第三方库PyPDF2，下面例子中进行的是将 origin.pdf 的第17页替换为 s17.pdf 的第1页：

import PyPDF2def replace_pages(original_pdf_path, replacement_pages):with open(original_pdf_path, 'rb') as original_file:original_pdf = PyPDF2.PdfReader(original_file)output_pdf = PyPDF2.PdfWriter()for page_num in range(len(original_pdf.pages)):if page_num == 16:  # Replace page 17 with first page of s17.pdfwith open(replacement_pages['s17'], 'rb') as replacement_file:replacement_pdf = PyPDF2.PdfReader(replacement_file)output_pdf.add_page(replacement_pdf.pages[0])else:output_pdf.add_page(original_pdf.pages[page_num])with open('output.pdf', 'wb') as output_file:output_pdf.write(output_file)# 定义要替换的页面和其对应的替换文件
replacement_pages = {'s17': 's17.pdf',
}replace_pages('origin.pdf', replacement_pages)

可以根据自己的实际需求进行修改。