Split pdf into poster with PyPDF2

#!/usr/bin/env python
# coding: utf8

import copy
import PyPDF2
import sys


def split_page(src, dst, row=1, col=1, margin=0):
    src_f = file(src, 'r+b')
    dst_f = file(dst, 'w+b')

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

    p = input.getPage(0)
    x0, y0 = p.mediaBox.lowerLeft
    x1, y1 = p.mediaBox.upperRight

    x_delta = float(x1-x0) / col
    y_delta = float(y1-y0) / row

    for j in range(col):
        for i in reversed(range(row)):
            q = copy.copy(p)
            q.mediaBox = copy.copy(p.mediaBox)
            q.mediaBox.lowerLeft = x0 + j * x_delta - margin, y0 + i * y_delta - margin
            q.mediaBox.upperRight = x0 + (j+1) * x_delta + margin, y0 + (i+1) * y_delta + margin
            output.addPage(q)

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

if __name__ == '__main__':
    input, output, row, col, margin = sys.argv[1:]
    split_page(input, output, int(row), int(col), int(margin))