从子进程调用python脚本不输出

Question

I have code in two environments, a windows machine with a Linux VM. I'm trying to create a script that builds the code on the windows side via a script, buildWindows.py , run on the Linux side.

I'm having the script ssh over to the windows side, and then run a python builder script windowsBuilder.py .

The issue I'm having is that the python builder script on the windows side takes a while to run, and nothing is being printed out until the program finishes. Is there a way to have the output print while the script is running, versus when it ends?

I'm assuming I'm having this issue because when you call a python script, it opens a new python environment, and it only returns information once the python environment is finished.

subprocess call in buildWindows.py :

COMMAND = "cd C:/codeLocation/; python windowsBuilder.py"
ssh = subprocess.Popen(["ssh", "%s" % IP_ADDRESS, COMMAND],
                   shell=False,
                   stdout=subprocess.PIPE)
for line in iter(ssh.stdout.readline, ''):
    sys.stdout.write(line)

Answer 1

Turn off buffering: bufsize=0 parameter passed to call

 ssh = subprocess.call(["ssh", "%s" % IP_ADDRESS, COMMAND],
                   shell=False,
                   stdout=subprocess.PIPE,
                   bufsize=0)