Merging multiple PDFs at specified pages

Question

I am trying to use Python to merge multiple PDFs at specific pages I want. So for instance, let's say we have 3 pdfs and I want to merge the second one at page 2 and the third one at page 22 of the first one.

This answer gave me something to work with and this is actually good if there are only two pdfs; however for more than 2 I couldn't make it work.

from PyPDF2 import PdfFileMerger

pdfs = ['sample1.pdf', 
        'sample2.pdf',
        'sample3.pdf']

merger = PdfFileMerger( )

for pdf in pdfs:
    merger.merge(3, pdf)

merger.write("result.pdf")
merger.close()

This will add sample2 after page 3 and then sample3 after page 3, which results in shifting sample2. I looked at the documentation of PdfFileMerger as well but could not find the elegant solution I wanted. I know I might be able to make it work with multiple tries(for instance, multiple for-loops), but I am hopeful there is a simple solution that does everything at one go.

Answer 1

The main idea is you start merging the pdfs in reverse order so that the pdf is merged at last which will not affect ordering.