Execute Commands Sequentially in Python?

Question

I would like to execute multiple commands in a row:

i.e. (just to illustrate my need):

cmd (the shell)

then

cd dir<

Answer 1

below python script have 3 function what you went just excute:

import sys
import subprocess

def cd(self,line):
    proc1 = subprocess.Popen(['cd'],stdin=subprocess.PIPE)
    proc1.communicate()

def ls(self,line):
    proc2 = subprocess.Popen(['ls','-l'],stdin=subprocess.PIPE)
    proc2.communicate()

def dir(silf,line):
    proc3 = subprocess.Popen(['cd',args],stdin=subprocess.PIPE)
    proc3.communicate(sys.argv[1])