executing a bash file - revisited

[Serafim]

First I assume that you have started your program with

import subprocess as sub

If not, the code makes no sense.

Even so, you try to invoke a shellscript, but that is not the intended use for subprocess. It is meant to start a process and one of the arguments may be a file. Your call makes subprocess try to interpret the argument as a file named "sh /home/pi/MagicMirror/restartMM.sh". If you take away "sh " it will complain about file permissions unless you have made it executable. Another way is:

import os
p = os.system("sh /home/pi/MagicMirror/restartMM.sh")
print(p)