exit a program gracefully

[Robert.T.Lynch at seagate.com]

In a python program I ask if the user wants to continue.  If they answer 
'no', what options do I have to halt execution?  I can put the rest of the 
code inside an "if bContinue:" block, but that seems awkward.  I have 
looked at raising an exception, and perhaps this is the preferred method, 
but it seems daunting to my non-OOP eyes.  Thanks -- Rob
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