File: alter.py

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#!/usr/bin/env python

'''
usage:   alter.py my.pdf

Creates alter.my.pdf

Demonstrates making a slight alteration to a preexisting PDF file.

'''

import sys
import os

import find_pdfrw
from pdfrw import PdfReader, PdfWriter

inpfn, = sys.argv[1:]
outfn = 'alter.' + os.path.basename(inpfn)

trailer = PdfReader(inpfn)
trailer.Info.Title = 'My New Title Goes Here'
writer = PdfWriter()
writer.trailer = trailer
writer.write(outfn)