用來執行shell指令

1、os.system()

system(command) -> exit_status
Execute the command (a string) in a subshell.

import os
result = os.system(‘ls /‘)
print(result)
print(type(result))

輸出：
bin  boot  data  dev  etc  home  lib  lib64  lost+found  media    mnt  opt  proc    root  sbin  selinux  srv  sys  tmp  usr  var
0      #只打印不保存輸出內容， 返回執行狀態，成功為0
 
<type ‘int‘>

2、os.popen()

popen(command [, mode=‘r‘ [, bufsize]]) -> pipe
Open a pipe to/from a command returning a file object.

import os
result = os.popen(‘ls /‘)
for line in result.readlines():
        print(line)
print(type(result))

輸出：     #保存輸出內容，返回一個‘file’

home
lib
lib64
lost+found
media
mnt
opt
proc
root
sbin
selinux
srv
sys
tmp
usr
var

 
<type ‘file‘>

3、

os.system commands subprocess