gistfile1.txt

rom pyPdf import PdfFileWriter
from pyPdf import PdfFileReader

from reportlab.pdfgen import canvas
from cStringIO import StringIO


def stamp_pdf(in_pdfname, image_name):

    pdf_in = PdfFileReader(file(in_pdfname, "rb"))
    page0 = pdf_in.getPage(0)

    img_temp = StringIO()
    img_doc = canvas.Canvas(img_temp)
    img_doc.drawImage(image_name, 420, 660, 200, 200, preserveAspectRatio=True)
    img_doc.save()  
    overlay = PdfFileReader(StringIO(img_temp.getvalue())).getPage(0)
    page0.mergePage(overlay)

    out_pdfname = in_pdfname + '-stamped.pdf'
    pdf_out = PdfFileWriter()
    pdf_out.addPage(page0)
    for count, page in enumerate(pdf_in.pages):
        if count > 0:
            pdf_out.addPage(page)
    pdf_out.write(file(out_pdfname, 'wb'))
    return out_pdfname

if __name__ == '__main__':
    import sys
    print stamp(sys.argv[1], sys.argv[2])