import PyPDF2

template = PyPDF2.PdfFileReader(open('super.pdf', 'rb'))
watermrk = PyPDF2.PdfFileReader(open('wtr.pdf', 'rb'))
output = PyPDF2.PdfFileWriter()


for i in range(template.getNumPages()):
	page = template.getPage(i)
	page.mergePage(watermrk.getPage(0))
	output.addPage(page)

with open('watermark_output.pdf','wb')as file:
	output.write(file)