from subprocess import Popen, PIPEprocess = Popen([r'path/to/process', 'arg1', 'arg2', 'arg3'], stdin=PIPE, stdout=PIPE)to_program = "something to send to the program's stdin"while process.poll() == None: # While not terminated process.stdin.write(to_program) from_program = process.stdout.readline() # Modify as needed to read custom amount of output if from_program == "something": # send something new based on stdout to_program = "new thing to send to program" else: to_program = "other new thing to send to program"print("Process exited with pre {}".format(process.poll()))
