ubuntu - which user's privileges python program uses to execute command via subprocess? -

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i have stabled password less login between 2 ubuntu system run following command 

$scp file user@hostname2:/tmp/

it works fine , got file transferred without asking password. when try execute same through following python statement-

subprocess.check_output(['scp', file, r'user@hostname2:/tmp/'])

i not able copy files remote computer, bit curious user's privileges python program uses execute command via subprocess ?

how can debug such programs ?


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