The scenario is, I have a Python script which part of it is to execute an external program using the code below:

subprocess.run(["someExternalProgram", "some options"], shell=True)

And when the external program finishes, it requires user to "press any key to exit".

Since this is just a step in my script, it would be good for me to just exit on behalf of the user.

Is it possible to achieve this and if so, how?

from subprocess import Popen, PIPEp = Popen(["someExternalProgram", "some options"], stdin=PIPE, shell=True)
p.communicate(input=b'\n')

If you want to capture the output and error log

from subprocess import Popen, PIPEp = Popen(["someExternalProgram", "some options"], stdin=PIPE, stdout=PIPE, stderr=PIPE, shell=True)
output, error = p.communicate(input=b'\n')

remember that the input has to be a bytes object