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An example of how to use reportlab library

Example of ReportLab PDF changes with Python.

How introduce changes on PDF files with Python

Here is an example to change PDF files using pyPdf and reportlab python libraries. It introduces a numeration on the PDF pages. At the same time there are commented several lines (with additional text for a heading).

 
from pyPdf import PdfFileWriter, PdfFileReader
import StringIO
from reportlab.pdfgen import canvas
from reportlab.lib.pagesizes import A4
from reportlab.lib.units import inch
from reportlab.lib.colors import Color, red, blue

blue50transparent = Color( 0, 0, 100, alpha=0.2)
from reportlab.graphics.shapes import Rect

#canvas.setFont("Times-Roman", 12)

# read your existing PDF
existing_pdf = PdfFileReader(file("ExamplePDFDossier.pdf", "rb"))
output = PdfFileWriter()

for i in range(existing_pdf.getNumPages()):
    packet = StringIO.StringIO()
    # create a new PDF with Reportlab
    can = canvas.Canvas(packet, pagesize=A4)
    for font in can.getAvailableFonts():
        print font
    #can.rect(225,25,100,100, fill=True, stroke=False)
    #can.setFillColor(blue50transparent)
    can.setFont("Times-BoldItalic", 12)
    #can.drawString(50, 755, "Applicant: Checa-Garcia")
    #can.drawString(250, 755, "Document: Teaching Dossier")
    offset = 0
    if i in [7,8,9,10,41,42,43,44,45]:
       offset = 50
    can.drawString(410, 765+offset, "Dossier Page: %i/%i" % (i+1,existing_pdf.getNumPages()))
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