Reverse page order in PDF file with Python

reverse.py

#!/usr/bin/python

""" 
This script reverse the pages of a PDF document and save it to a new file.
Dependancy :
 - "PDFRW"

Usage :
- `pip install pdfrw`
- `python reverse.py file.pdf`
"""
from pdfrw import PdfReader, PdfWriter
import sys
import os

def reverse(pdf_file):
	writ = PdfWriter()
	read = PdfReader(pdf_file)

	for page in reversed(read.pages):
		writ.addpage(page)

	writ.write('reversed_%s' % pdf_file)



if __name__ == "__main__":
	if(len(sys.argv) == 1):
		print("Usage `python reverse.py mypdffile.pdf`")
		exit(0)
	pdf = sys.argv[1]
	if os.path.isfile(pdf): 
		reverse(pdf)
		print("Reversed file '%s'" % pdf)
	else:
		print("File not found")

pyhton3 reverse.py 1.pdf

output:
[ERROR] uncompress.py:72 Error -3 while decompressing data: incorrect header check (20755, 0)
[ERROR] uncompress.py:72 Error -3 while decompressing data: incorrect header check (20757, 0)
[ERROR] uncompress.py:72 Error -3 while decompressing data: incorrect header check (20758, 0)
[ERROR] uncompress.py:72 Error -3 while decompressing data: incorrect header check (20753, 0)
[ERROR] uncompress.py:72 Error -3 while decompressing data: incorrect header check (20760, 0)
[ERROR] uncompress.py:72 Error -3 while decompressing data: incorrect header check (20754, 0)
[ERROR] uncompress.py:72 Error -3 while decompressing data: incorrect header check (20759, 0)
[ERROR] uncompress.py:72 Error -3 while decompressing data: incorrect header check (20764, 0)
[ERROR] uncompress.py:72 Error -3 while decompressing data: incorrect header check (20765, 0)
[ERROR] uncompress.py:72 Error -3 while decompressing data: incorrect header check (20756, 0)
[ERROR] uncompress.py:72 Error -3 while decompressing data: incorrect header check (20761, 0)
[ERROR] uncompress.py:72 Error -3 while decompressing data: incorrect header check (20763, 0)
[ERROR] uncompress.py:72 Error -3 while decompressing data: incorrect header check (20762, 0)
[WARNING] tokens.py:228 Did not find PDF object (2319, 0) (line=179958, col=1, token='endobj')
[ERROR] pdfreader.py:472 Invalid page tree: 'NoneType' object is not subscriptable

note: used it on a scanned pdf.
any idea?