Merging pdf with pypdf2

I'm willing to work with PyPdf2 library and even installed it properly but facing the following when I try to import it.
Any help will be appreciated.

its generally better to look of java libs, instead of pyhton libs when working in jython.

what are you trying to do?

I have some pdfs with me in the form of Report byte arrays. My end goal is to combine this pdfs.

Consider using the command line version of PDFtk, called from Ignition to work on temporary files, using ProcessBuilder to know when done.