python 执行系统命令后获取返回值

 1 import os, subprocess
 2 
 3 #1
 4 os.system(‘dir‘)      #执行系统命令
 5 
 6 #2
 7 result = os.popen(‘dir‘)       #执行系统命令，返回值为result
 8 res = result.read()
 9 for line in res.splitlines():
10      print(line)
11 
12 #3
13 #用subprocess库获取返回值
14 p = subprocess.Popen(‘dir‘, shell=True, stdout=subprocess.PIPE)
15 out, err = p.communicate()
16 for line in out.splitlines():
17      print(line)
18