PYPDF2：无法在PDF中的所有页面中添加/合并水印

Question

我只想在每个页面的方向上添加所有页面上的水印/背景。对于肖像和面向景观的页面，水印/背景将有所不同。

这是我的代码，只是为了在所有页面

from typing import BinaryIO
import PyPDF4
import PyPDF2
from PyPDF2 import PdfFileReader, PdfFileWriter, PdfFileMerger
from tkinter.filedialog import askopenfilename
from fpdf import FPDF

input_file = askopenfilename()
pdf = PdfFileReader(input_file)
watermark = PyPDF2.PdfFileReader(open('F:\abc\abc\PDF 
Templates\Report First - Potrait.pdf', 'rb'))
output = PdfFileWriter()

watermarks = watermark.getPage(0)

with open(input_file, "rb+") as filehandle_input:
# read content of the original file
pdfReader = PyPDF2.PdfFileReader(filehandle_input)
print(pdfReader.numPages)
total_numbers = pdfReader.getNumPages()
for i in range(0,total_numbers):
    if i < total_numbers:
        deg = pdf.getPage(i).get('/Rotate')
        page = pdf.getPage(i).mediaBox
        if page.getUpperRight_x() - page.getUpperLeft_x() > page.getUpperRight_y() - page.getLowerRight_y():
            if deg in [0, 180, None]:
                print('Landscape1')
            else:
                print('Portrait1')

        else:
            if deg in [0, 180, None]:
                print('Portrait2')
                page_s = pdfReader.getPage(i)
                page_s.mergePage(watermarks)
                output.addPage(page_s)

            else:
                print('Landscape2')

with open(input_file.rsplit(".", 1)[0] + '_FP.pdf', "wb") as merged_file:
    output.write(merged_file)

错误中添加水印：

Traceback (most recent call last):
  File "C:\Users\xyz\Desktop\PFD python\abc\PFD python\test2.py", line 23, in <module>
    page.mergePage(watermarks)
  File "C:\Users\xyz\AppData\Local\Programs\Python\Python310\lib\site-packages\PyPDF2\pdf.py", line 2417, in mergePage
    self._mergePage(page2)
  File "C:\Users\xyz\AppData\Local\Programs\Python\Python310\lib\site-packages\PyPDF2\pdf.py", line 2426, in _mergePage
    originalResources = self[PG.RESOURCES].getObject()
  File "C:\Users\xyz\AppData\Local\Programs\Python\Python310\lib\site-packages\PyPDF2\generic.py", line 539, in __getitem__
    return dict.__getitem__(self, key).getObject()
KeyError: '/Resources'