Zmiana strony w zaproszeniu; pliku pdf na stronę z innego pliku pdf

import os
from PyPDF2 import PdfReader, PdfWriter

def replace_third_page_with_first(dir_path, replacement_file, output_dir):
    with open(replacement_file, 'rb') as replacement_pdf_file:
        replacement_pdf = PdfReader(replacement_pdf_file)
        first_page = replacement_pdf.pages[0]

        for filename in os.listdir(dir_path):
            if filename.endswith('.pdf'):
                pdf_path = os.path.join(dir_path, filename)
                output_pdf_path = os.path.join(output_dir, 'modified_' + filename)

                with open(pdf_path, 'rb') as pdf_file:
                    pdf = PdfReader(pdf_file)
                    writer = PdfWriter()

                    for page_num, page in enumerate(pdf.pages):
                        if page_num == 2:
                            writer.add_page(first_page)
                        else:
                            writer.add_page(page)

                    with open(output_pdf_path, 'wb') as output_pdf_file:
                        writer.write(output_pdf_file)

directory_path = './Zaproszenia'
replacement_pdf_file = './trzeciaStrona.pdf'
output_directory_path = './Poprawione'

if not os.path.exists(output_directory_path):
    os.makedirs(output_directory_path)

replace_third_page_with_first(directory_path, replacement_pdf_file, output_directory_path)