Pdf Duplex printing split file

PdfSplitter.py

#!/usr/bin/python3

import argparse
import os
import sys
from pathlib import Path

from PyPDF2 import PdfFileWriter, PdfFileReader


#/home/v/Downloads/Ancient_merged.pdf
from PyPDF2.pdf import PageObject, NameObject, RectangleObject, NullObject, DictionaryObject

def isfileexist(path:str)->bool:
    my_file = Path(path)
    if my_file.is_file():
        print(f"File \"{path}\" aready exist!!!")
        return True
    return False


parser = argparse.ArgumentParser()
parser.add_argument('-f', '--pdf_file')
parser.add_argument('-s', '--suffix')
parser.add_argument('-r', '--reverse' ,action='store_true')
parser.add_argument('-m', '--modified' ,action='store_true')


args = parser.parse_args()

###########
suffix=""
if args.suffix is not None:
    suffix=args.suffix+"_"
################
if args.pdf_file is None:
    print("Please insert pdf file")
    sys.exit()
###############
flag_reverse_even=False
if args.reverse:
    print("Even page will make reverse...")
    flag_reverse_even=True
################
modified_file_storage=None
if args.modified:
    modified_file_storage=f"{suffix}{os.path.splitext(args.pdf_file)[0]}_Modified.pdf"
    print(f"Soring if filed is modified in \"{modified_file_storage}\"")

odd_file=f"{suffix}{os.path.splitext(args.pdf_file)[0]}_Odd_Print_First.pdf"
even_file=f"{suffix}{os.path.splitext(args.pdf_file)[0]}_Even_Print_Second.pdf"
######exit if file aready exist
if isfileexist(odd_file):
    sys.exit()
if isfileexist(even_file):
    sys.exit()
##############################
my_file = Path(args.pdf_file)
if not my_file.is_file():
    print(f"There is no such file \"{args.pdf_file}\"")
    sys.exit()

inputpdf = PdfFileReader(open(args.pdf_file, "rb"))

odd_output = PdfFileWriter()
even_output = PdfFileWriter()
print("Starting job\n")

odd_pages=[]
evenpages=[]

for i in range(inputpdf.numPages):
    if i % 2==1:#it is even page
        evenpages.append(i)
    else:
        odd_pages.append(i)

flag_same_page=len(evenpages) == len(odd_pages)

for odd_page in odd_pages:
    odd_output.addPage(inputpdf.getPage(odd_page))

if flag_reverse_even:
    evenpages.reverse()
    if not flag_same_page:
        #######create a blank page #########
        ###########################
        blank_page = PageObject.createBlankPage(inputpdf)
        #########################################
        even_output.addPage(blank_page)

for even_page in evenpages:
    even_output.addPage(inputpdf.getPage(even_page))
if not flag_reverse_even and not flag_same_page:
    even_output.addBlankPage()

print("\n")
with open(odd_file , "wb") as outputStream:
    odd_output.write(outputStream)
with open(even_file , "wb") as outputStream:
    even_output.write(outputStream)