from subprocess import PIPE, Popen, CREATE_NEW_CONSOLE, run

subProcess = Popen("Python", stdin=PIPE, stdout=PIPE, text=True, universal_newlines=True)

subProcess.stdin.write('Print("HelloWorld")')

subProcess.stdin.flush()

for line in subProcess.stdout:
    print(">>> " + str(line.rstrip()))
    subProcess.stdout.flush()