Python, "subprocess.check_ouput()" hangs while installing rpm -


i trying install .rpm through subprocess.check_ouput() i.e. 

buff=subprocess.check_output(["rpm","-ivh","package_name"])

even though package installed, python script stuck @ instruction (not executing below instructions.)

please note other "rpm" operation working subprocess.check_output()

after including shell=true, i.e.

buff=subprocess.check_output(["rpm","-ivh","package_name"],shell=true)

package not getting installed , throwing error @ instruction, error : rpm usage

can help?


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