Doubt regarding exec function

[Mosas]

Dear All,
     Php has exec function to run system commands and
this function return last line of system command
result.  But in Python I can see only os.system()
function to run system command but it doesn't return
any result like php exec function.
     I want to know about php equivalent exec function
in Python.
     So If anyone know regarding this Kindly Mail me.
with regards
prabahar

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