# 方法1
import subprocess
pSP = subprocess.Popen("ls -al", stderr=subprocess.STDOUT, stdout=subprocess.PIPE. shell=True, preexec_fn=None)

# 方法2
import os
os.system("ping 192.168.150.131")

# 方法2
import commands
(status, output) = commands.getstatusoutput("ls -al")