要同时获取过程输出和返回的代码：
from subprocess import Popen, PIPEp = Popen(["ls", "non existent"], stdout=PIPE)output = p.communicate()[0]print(p.returnpre)
subprocess.CalledProcessError是一类。要访问，请
returnpre使用异常实例：
from subprocess import CalledProcessError, check_outputtry: output = check_output(["ls", "non existent"]) returnpre = 0except CalledProcessError as e: output = e.output returnpre = e.returnpreprint(returnpre)
