Splitting PDF pages mid-way and re-combining it?

Question

I dont have enough reputation score right now to answer a question I found - how to use python to split pdf pages into half and recombine it for further processing ..

#!/usr/bin/env python

'''

Chops each page in half, e.g. if a source were
created in booklet form, you could extract individual
pages, and re-combines it
'''
from PyPDF2 import PdfFileWriter,PdfFileReader,PdfFileMerger
#split left
with open("docu.pdf", "rb") as in_f:
    input1 = PdfFileReader(in_f)
    output = PdfFileWriter()

    numPages = input1.getNumPages()

    for i in range(numPages):
        page = input1.getPage(i)
        page.cropBox.lowerLeft = (60, 50)
        page.cropBox.upperRight = (305, 700)
        output.addPage(page)

    with open("left.pdf", "wb") as out_f:
        output.write(out_f)
#split right
with open("docu.pdf", "rb") as in_f:
    input1 = PdfFileReader(in_f)
    output = PdfFileWriter()

    numPages = input1.getNumPages()

    for i in range(numPages):
        page = input1.getPage(i)
        page.cropBox.lowerLeft = (300, 50)
        page.cropBox.upperRight = (540, 700)
        output.addPage(page)

    with open("right.pdf", "wb") as out_f:
        output.write(out_f)

#combine splitted files
input1 = PdfFileReader(open("left.pdf","rb"))
input2 = PdfFileReader(open("right.pdf","rb"))
output = PdfFileWriter()
numPages = input1.getNumPages()

for i in range(numPages):
    l = input1.getPage(i)
    output.addPage(l)
    r = input2.getPage(i)
    output.addPage(r)

with open("out.pdf", "wb") as out_f:
    output.write(out_f)

Note : The cropping parameters are specific for your PDF , so, please, check it before execution of the program.

Further : Now, You can use this document to extract text easily without getting the columns merged into each other -- messed up extraction ..