Split PDF spreads into pages. Arguments are: <pdf> <minimum_width_of_pages_to_split>

split.py

from PyPDF2 import PdfFileWriter, PdfFileReader
import sys

original_name = sys.argv[1]
min_spread_width = int(sys.argv[2])

original = PdfFileReader(open(original_name, 'rb'))
output = PdfFileWriter()

def getBoxSize(box):
	return (box.upperRight[0] - box.upperLeft[0], box.upperRight[1] - box.lowerRight[1])

for i in range(0, original.getNumPages()):
	page = original.getPage(i)
	box = getBoxSize(page.cropBox)
	if box[0] >= min_spread_width:
		left = output.addBlankPage(width=box[0]/2, height=box[1])
		right = output.addBlankPage(width=box[0]/2, height=box[1])
		left.mergeTranslatedPage(page, 0, 0)
		right.mergeTranslatedPage(page, -box[0]/2, 0)
	else:
		output.addPage(page)


outputStream = file(original_name+".split.pdf", "wb")
output.write(outputStream)