python 화면 출력 값을 문자열로 가져오기

import subprocess 

def get_build_version():

out = subprocess.Popen('ls -al', shell=True, stdout=subprocess.PIPE).stdout 

return out.readline()

출처: http://python.kr/viewtopic.php?t=25176

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import popen2

def get_build_version():

r, w, e = popen2.popen3('adb devices')

return r.readlines()