popen

def _command_execute(command_s):
    """执行命令，例如command_s=['ls', '-al']"""
    sp = Popen(command_s, stdout=PIPE, stderr=STDOUT, close_fds=True)
    output_content = ''
    for line in iter(sp.stdout.readline, b''):
        output_content += line
        if len(output_content) > 1024 * 4:
            break
    sp.wait()
    return int(sp.returncode), output_content