Run Ghost blog locally with python script

I have installed ghost blog locally on Windows 10.

To run ghost, I run the following the commands manually on Windows prompt;

$ C:\Users\johnK\Dropbox\jk\ghost
$ ghost start

I want to automate this with a Python script. This is how my Python script looks.

import os
    
os.system(r"C:\Users\johnK\Dropbox\jk\ghost")
os.system("ghost start")

Unfortunately, I get the following error;

'C:\Users\johnK\Dropbox\jk\ghost' is not recognized as an
internal or external command, operable program or batch file.
Working directory is not a recognisable Ghost installation.
Run `ghost start` again within a folder where Ghost was installed
with Ghost-CLI.

I am using Python v3.9, Windows 10

from Run Ghost blog locally with python script