Demonstration of merging text onto existing pdf

goodbye.py

from PyPDF2 import PdfFileWriter, PdfFileReader
import StringIO
from reportlab.pdfgen import canvas
from reportlab.lib.pagesizes import letter

# Create a new PDF with the text to overlay
packet = StringIO.StringIO()
can = canvas.Canvas(packet)
can.drawString(200, 100, "Goodbye World")
can.save()

# Move to the beginning of the buffer
packet.seek(0)
new_pdf = PdfFileReader(packet)

# Read the existing pdf
existing_pdf = PdfFileReader(file("hello.pdf", "rb"))
output = PdfFileWriter()

# Merge the contents of the two pages
page = existing_pdf.getPage(0)
page.mergePage(new_pdf.getPage(0))
output.addPage(page)

# Write out the new file
outputStream = file("destination.pdf", "wb")
output.write(outputStream)
outputStream.close()

hello.py

from reportlab.pdfgen import canvas
def hello(c):
    c.drawString(100,100,"Hello World")
 
c = canvas.Canvas("hello.pdf")
hello(c)
c.showPage()
c.save()