Unable to store terminal output of subprocess with python -

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my code has 2 potential outcomes in terminal: can't connect rfcomm socket: permission denied , can't connect rfcomm socket: host down. need store either result string in variable, i've tried has failed. code thought it:

from subprocess import check_output  out = check_output(["sudo", "rfcomm", "connect", "0", "aa:bb:cc:dd:ee:ff", "10"]) print "output: %s" % out

instead nothing:

user:~/home $./foo.py can't connect rfcomm socket: permission denied output:

another attempt:

proc = subprocess.popen(["sudo rfcom connect 0 aa:bb:cc:dd:ee:ff 10"], stdout=subprocess.pipe, shell=true) (out, err) = proc.communicate() print "output: %s" % out, err

this @ least gives me when print. unfortunately it's "none" telling me there no error , not actual output:

user:~/home $./foo.py can't connect rfcomm socket: permission denied output:  none

i've tried this this this this , couple others. i'm sure i'm missing piece of critical knowledge somewhere. pointers!

rfcomm apparently writing output standard error, yet capturing standard output. capture both, include stderr=subprocess.stdout in call check_output:

subprocess.check_output(["sudo", "rfcomm", "connect", "0", "aa:bb:cc:dd:ee:ff", "10"],                         stderr=subprocess.stdout)

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