[Python] Print A6 double sided booklet using python and Latex

I want to print a A6 booklet double sided. Even though this question has been posted a lot on the internet I could not find any suitable solution. I figure out a way using both Latex and python. I use this Latex code :

\documentclass[a4paper]{article}
\usepackage[margin=0pt]{geometry}
\usepackage[skins,raster]{tcolorbox}
\pagestyle{empty}
\begin{document}
\begin{tcbraster}[raster height=\textheight,raster equal skip=0pt,blank,

graphics pages={8,1,6,3, 2,7,4,5}]
\tcbincludepdf{a6.pdf}% <-- The A6 document with 8 pages
\end{tcbraster}
\end{document}


To rearange the page in the right order (a6.pdf being my document to print), and I use this python code :

L=[]
for i in range(0,100,8):
L.append(i+8)
L.append(i+1)
L.append(i+6)
L.append(i+3)
L.append(' '+str(i+2))
L.append(i+7)
L.append(i+4)
L.append(i+5)


to generate the list of pages in the right order (here for 100 pages).

1. 
   How can I get python to print horizontally with coma (8,1,6,3,...)? With this thread python: printing horizontally rather than current default printing I can print horizontally but not with comas.
   
   
2. 
   Could I use PyPDF2 to rearrange the page and get rid of this latex script?
   

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