real time subprocess.Popen via stdout and PIPE

Question

I am trying to grab stdout from a subprocess.Popen call and although I am achieving this easily by doing:

cmd = subprocess.Popen(\'         


        

Answer 1

cmd = subprocess.Popen(["ls", "-l"], stdout=subprocess.PIPE)
for line in cmd.stdout:
    print line.rstrip("\n")

Answer 2

The call to readlines is waiting for the process to exit. Replace this with a loop around cmd.stdout.readline() (note singular) and all should be well.