Running multiple Python scripts simultaneously and then sequentially

Question

I can run multiple Python scripts simultaneously from a bash script like this;

#!/bin/bash
python pr1.py & 
python pr2.py &
python aop.py &
python loader.py &

But what if I want a batch to fire simultaneously and after they've run, start some more sequentially. Will this work?:

#!/bin/bash
python pr1.py & 
python pr2.py &
python ap.py &
python loader.py
python cain.py
python able.py

Answer 1

Once you put & at the end, it runs as a background process. Hence all the scripts ending with & run in parallel.

To run the other 3 scripts in sequential order you can try both:

&& runs the next script only if the preceding script has run successfully

python loader.py && python cain.py && python able.py 

|| runs scripts sequentially irrespective of the result of preceding script

python loader.py || python cain.py || python able.py