execute schell command in python script

steshell.py

import subprocess
import sys
 
def sh(cmd, dbg = False):
    if dbg:
        print(cmd)

    process = subprocess.Popen(cmd.split(), stdout=subprocess.PIPE)
    ret = process.communicate()[0]

    if dbg:
        print(ret)

    return ret

def ssh(ssh, arg, dbg = False):
    if dbg:
        print(ssh)
        print(arg)

    cmd = ssh.split()
    cmd.append(arg)

    process = subprocess.Popen(cmd)
    ret = process.communicate()[0]

    if dbg:
        print(ret)

    return ret


def shpipe(cmds, dbg = False):
    if dbg:
        print(cmds)

    prev_stdout = None
    for cmd in cmds:
        p = subprocess.Popen(cmd.split(), stdin = prev_stdout, stdout=subprocess.PIPE)
        prev_stdout = p.stdout
    ret = p.communicate()[0]

    if dbg:
        print(ret)
    return ret