os.system question

[stanleyxu]

To note this problem occurs when debugging script in IDLE editor.
When I double click on my_script.py, all outputs will be printed in one 
console.

-- 
        ___
   oo  // \\
  (_,\/ \_/ \     Xu, Qian
    \ \_/_\_/>      stanleyxu2005
    /_/   \_\