import subprocess

def test(cmd):

    p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)

    lines = p.stdout.readlines()

    for line in lines:

        tmp = line.decode('gbk').strip()

        print(tmp)

def test1(cmd):

    p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)

    for i in iter(p.stdout.readline, ''):

        if len(i) < 1:

            break

        print(i.decode('gbk').strip())

if __name__ == '__main__':

    test("ping www.baidu.com")

    test1("ping www.baidu.com")