python - Using subprocess and pkexec -

i'm trying use run command alongside pkexec, says no such file found.

process = subprocess.popen(["pkexec cat", "/dev/input/event4"], stdout=subprocess.pipe) line in iter(process.stdout.readline, ''):   sys.stdout.write(line) 

oserror: [errno 2] no such file or directory

however, path okay , file there.

you want use:

subprocess.popen(["pkexec", "cat", "/dev/input/event4"]) 

since subprocess.popen quotes each entry in list; example same using on commandline:

$ "pkexec cat" /dev/input/event4 

instead of:

$ pkexec cat /dev/input/event4 

from the documentation (emphasis mine):

args required calls , should string, or sequence of program arguments. providing sequence of arguments preferred, allows module take care of required escaping , quoting of arguments (e.g. permit spaces in file names). if passing single string, either shell must true (see below) or else string must name program executed without specifying arguments.