How to force 2 Python subprocesses to run one after the other

Question

I want to run 2 programs in Python one after the other. I use Popen but it appears they run in parallel. I have something like this:

p1 = Popen(['./program1'])
p2 = Popen(['./program2'])

How can I make p2 to start only when p1 finish?

Thank you

Answer 1

this should work.

p1 = Popen(['./program1'])
p1.wait()
p2 = Popen(['./program2'])
p2.wait()

it will cause the program to block until each subprocess exits.