from PyPDF2 import PdfFileWriter, PdfFileReader

output = PdfFileWriter()
input1 = PdfFileReader(open("document1.pdf", "rb"))

# print how many pages input1 has:
print("document1.pdf has %d pages." % input1.getNumPages())

# print how many pages input1 has in python3:
# print("This chart has {} pages.".format(input1.getNumPages()))

# add page 1 from input1 to output document, unchanged:
output.addPage(input1.getPage(0))

# add page 2 from input1, but rotated clockwise 90 degrees:
output.addPage(input1.getPage(1).rotateClockwise(90))

# add page 3 from input1, rotated the other way:
output.addPage(input1.getPage(2).rotateCounterClockwise(90))
# alt: output.addPage(input1.getPage(2).rotateClockwise(270))

# add page 4 from input1, but first add a watermark from another PDF:
page4 = input1.getPage(3)
watermark = PdfFileReader(open("watermark.pdf", "rb"))
page4.mergePage(watermark.getPage(0))
output.addPage(page4)


# add page 5 from input1, but crop it to half size:
page5 = input1.getPage(4)
page5.mediaBox.upperRight = (
    page5.mediaBox.getUpperRight_x() / 2,
    page5.mediaBox.getUpperRight_y() / 2
)
output.addPage(page5)

# add some Javascript to launch the print window on opening this PDF.
# the password dialog may prevent the print dialog from being shown,
# comment the the encription lines, if that's the case, to try this out:
output.addJS("this.print({bUI:true,bSilent:false,bShrinkToFit:true});")

# encrypt your new PDF and add a password:
password = "secret"
output.encrypt(password)

# add a title to your new PDF's metadata:
output.addMetadata({'/Title': 'PDF Metadata Title'})

# finally, write "output" to document-output.pdf
with open("PyPDF2-output.pdf", "wb") as outputStream:
    output.write(outputStream)