PDF Extract using CSV values

[BashBedlam]

First off, there's no page zero so your first entry should start with a one. Secondly, I may have misunderstood your intended outcome. Try this and see if it's more what you had in mind.

from PyPDF2 import PdfFileReader, PdfFileWriter
  
pdf_file_path = 'document.pdf'
file_base_name = pdf_file_path.replace('.pdf', '')
  
pdf = PdfFileReader(pdf_file_path)
  
with open ('page values.csv', 'r') as page_values_file :
	page_values_file.readline () # dump the header
 
	for line in page_values_file :
		page_values = line.strip ().split (',')
		setpage = int (page_values [0])
		startpage = int (page_values [1])
		endpage = int (page_values [2])


		pdfWriter = PdfFileWriter()
		for page_num in range(startpage,endpage):
			pdfWriter.addPage(pdf.getPage(page_num))
			with open("%(n)s_subset_%(b)s.pdf" % {'n': format(file_base_name), 'b': setpage }, 'wb') as f:
				pdfWriter.write(f)