This Section imports the necessary classes from the PyPDF2 library

from PyPDF2 import PdfFileReader, PdfFileWriter

from PyPDF2.pdf import ContentStream

from PyPDF2.generic import TextStringObject, NameObject

from PyPDF2.utils import b_

>The watermark says SAMPLE on it so I've tried different capitalization cases

wm_text = 'Sample'

replace_with = ''

>I'm hoping to just replace the SAMPLE watermark with nothing so a space could suffice

> Load PDF into pyPDF

source = PdfFileReader(open('input.pdf', "rb"))

output = PdfFileWriter()

> For each page

for page in range(source.getNumPages()):

# Get the current page and it's contents

page = source.getPage(page)

content_object = page["/Contents"].getObject()

content = ContentStream(content_object, source)

> Loop over all pdf elements

for operands, operator in content.operations:

Was told to adapt this part dependent on my PDF file

if operator == b_("TJ"):

text = operands[0][0]

if isinstance(text, TextStringObject) and text.startswith(wm_text):

operands[0] = TextStringObject(replace_with)

Set the modified content as content object on the page

page.__setitem__(NameObject('/Contents'), content)

Add the page to the output

output.addPage(page)

Write the stream

outputStream = open("output.pdf", "wb")

output.write(outputStream)

解决方案

Using the code from the question here is a function that works in Python 3.

def removeWatermark(wm_text, inputFile, outputFile):

from PyPDF4 import PdfFileReader, PdfFileWriter

from PyPDF4.pdf import ContentStream

from PyPDF4.generic import TextStringObject, NameObject

from PyPDF4.utils import b_

with open(inputFile, "rb") as f:

source = PdfFileReader(f, "rb")

output = PdfFileWriter()

for page in range(source.getNumPages()):

page = source.getPage(page)

content_object = page["/Contents"].getObject()

content = ContentStream(content_object, source)

for operands, operator in content.operations:

if operator == b_("Tj"):

text = operands[0]

if isinstance(text, str) and text.startswith(wm_text):

operands[0] = TextStringObject('')

page.__setitem__(NameObject('/Contents'), content)

output.addPage(page)

with open(outputFile, "wb") as outputStream:

output.write(outputStream)

wm_text = 'wm_text'

inputFile = r'input.pdf'

outputFile = r"output.pdf"

removeWatermark(wm_text, inputFile, outputFile)