How do I reverse the order of the pages in a pdf file using pyPdf?

Question

I have a pdf file "myFile.pdf". I would like to reverse the order of its pages using pyPdf. How?

Answer 1

from pyPdf import PdfFileWriter, PdfFileReader
output_pdf = PdfFileWriter()

with open(r'input.pdf', 'rb') as readfile:
    input_pdf = PdfFileReader(readfile)
    total_pages = input_pdf.getNumPages()
    for page in xrange(total_pages - 1, -1, -1):
        output_pdf.addPage(input_pdf.getPage(page))
    with open(r'output.pdf', "wb") as writefile:
        output_pdf.write(writefile)