pyPDF2 merge 2 pdf pages into one

merge_pdfs.py

from PyPDF2 import PdfFileReader, PdfFileWriter
from PyPDF2.pdf import PageObject


reader = PdfFileReader(open("invoice.pdf",'rb'))
invoice_page = reader.getPage(0)
sup_reader = PdfFileReader(open("supplement.pdf",'rb'))
sup_page = sup_reader.getPage(1)  # We pick the second page here

translated_page = PageObject.createBlankPage(None, sup_page.mediaBox.getWidth(), sup_page.mediaBox.getHeight())
translated_page.mergeScaledTranslatedPage(sup_page, 1, 0, -400)  # -400 is approximate mid-page

translated_page.mergePage(invoice_page)

writer = PdfFileWriter()
writer.addPage(translated_page)

with open('out.pdf', 'wb') as f:
	writer.write(f)

An extra simple way to merge unlimited pdf's:

import PyPDF2
import sys

#inputs = sys.argv[1:] # From input (without spaces!)
inputs = ['test 1.pdf', 'test 2.pdf'] # Add those pdf's to your project

def pdf_combine(pdf_list):
    merger = PyPDF2.PdfFileMerger()
    for pdf in pdf_list:
        merger.append(pdf)
    merger.write('merge.pdf')

pdf_combine(inputs)