Python script to add JS to pdf so the pdf will print immediately when opened

python-printJS-in-pdf.py

# IE users need: https://get.adobe.com/reader/

from PyPDF2 import PdfFileWriter, PdfFileReader

output = PdfFileWriter()
ipdf = PdfFileReader(open('old.pdf', 'rb'))

for i in xrange(ipdf.getNumPages()):
	page = ipdf.getPage(i)
	output.addPage(page)

with open('new.pdf', 'wb') as f:
	output.addJS("this.print({bUI:true,bSilent:false,bShrinkToFit:true});")
	output.write(f)

Yes, still not working