Split a PDF vertically, used for scanned double sided PDF pages

split-page.py

# Source http://stackoverflow.com/a/15741856/1301753

import copy
import sys
import math
import PyPDF2

def split_pages(src, dst):
    src_f = open(src, 'r+b')
    dst_f = open(dst, 'w+b')

    input = PyPDF2.PdfFileReader(src_f)
    output = PyPDF2.PdfFileWriter()

    for i in range(input.getNumPages()):
        p = input.getPage(i)
        q = copy.copy(p)
        q.mediaBox = copy.copy(p.mediaBox)

        x1, x2 = p.mediaBox.lowerLeft
        x3, x4 = p.mediaBox.upperRight

        x1, x2 = math.floor(x1), math.floor(x2)
        x3, x4 = math.floor(x3), math.floor(x4)
        x5, x6 = math.floor(x3/2), math.floor(x4/2)

        if x3 > x4:
            # horizontal
            p.mediaBox.upperRight = (x5, x4)
            p.mediaBox.lowerLeft = (x1, x2)

            q.mediaBox.upperRight = (x3, x4)
            q.mediaBox.lowerLeft = (x5, x2)
        else:
            # vertical
            p.mediaBox.upperRight = (x3, x4)
            p.mediaBox.lowerLeft = (x1, x6)

            q.mediaBox.upperRight = (x3, x6)
            q.mediaBox.lowerLeft = (x1, x2)

        output.addPage(p)
        output.addPage(q)

    output.write(dst_f)
    src_f.close()
    dst_f.close()

input_file=input("Enter the original PDF file name :")
output_file=input("Enter the splitted PDF file name :")

split_pages(input_file,output_file)

Changed some lines of the script in order to make it work with python 3.
See:

• https://stackoverflow.com/questions/42130504/unable-to-use-pypdf-module
• https://openclassrooms.com/forum/sujet/raw-input-is-not-defined
• https://stackoverflow.com/questions/16736833/python-nameerror-name-file-is-not-defined