Python execute comand

cmd_execute

import subprocess, shlex

def cmd_execute(command):
    cmd = shlex.split(command, posix = False)
    try:
        p = subprocess.Popen(cmd, stdout = subprocess.PIPE, stderr = subprocess.STDOUT)
        preturn = p.wait()
        stdout = ''
        tmp_stdout = p.stdout.readline()
        while tmp_stdout:
            stdout = stdout + tmp_stdout.decode('UTF-8')
            tmp_stdout = p.stdout.readline()
        stderr = ''
        tmp_stderr = p.stderr.readline()
        while tmp_stderr:
            stderr = stderr + tmp_stdout.decode('UTF-8')
            tmp_stdout = p.stderr.readline()
        if preturn != 0:
          print("Error executing {command} ({error}):\nSTDERR: {stderr}\nSTDOUT:{stdout}".format(
            stderr=stderr, stdout=stdout, command=command, error=preturn))
        return [preturn, stdout, stderr]
    except Exception as e:
        print("Exception on execution:\n{exception}".format(exception=e))
        return None