why does the script doesn't run as source but run as python?

[machineA tmp]# service puppet status puppet is stopped [machineA tmp]# /etc/cron.daily/ensure_puppet [machineA tmp]# service puppet status puppet is stopped [machineA tmp]# python /etc/cron.daily/ensure_puppet Starting puppet agent: [ OK ] [machineA tmp]# service puppet status puppet (pid 16378) is running... 

#!/usr/bin/python import platform import os import commands def chkrun(): output = commands.getoutput('ps -A') if 'puppet' in output: return 1 #running else: return 0 #not running def run(): if chkrun() == 0: if platform.dist()[1][0] == '7': os.system("/usr/sbin/service puppet start") else: os.system("/sbin/service puppet start") run()