Let exception fire or return None

From	Cecil Westerhof <Cecil@decebal.nl>
Newsgroups	comp.lang.python
Subject	Let exception fire or return None
Organization	Decebal Computing
Date	2015-04-30 09:43 +0200
Message-ID	<87bni6awol.fsf@Equus.decebal.nl> (permalink)

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I have a function to fetch a message from a file:
    def get_indexed_message(message_filename, index):
        """
        Get index message from a file, where 0 gets the first message
        """

        return open(expanduser(message_filename), 'r').readlines()[index].rstrip()

What is more the Python way: let the exception fire like this code
when index is to big, or catching it and returning None?

I suppose working zero based is OK.

-- 
Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof

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Let exception fire or return None Cecil Westerhof <Cecil@decebal.nl> - 2015-04-30 09:43 +0200
  Re: Let exception fire or return None Dave Angel <davea@davea.name> - 2015-04-30 04:18 -0400
    Re: Let exception fire or return None Cecil Westerhof <Cecil@decebal.nl> - 2015-04-30 11:13 +0200
  Re: Let exception fire or return None Peter Otten <__peter__@web.de> - 2015-04-30 11:30 +0200
    Re: Let exception fire or return None Cecil Westerhof <Cecil@decebal.nl> - 2015-04-30 13:26 +0200
      Re: Let exception fire or return None Peter Otten <__peter__@web.de> - 2015-04-30 14:28 +0200
        Re: Let exception fire or return None Cecil Westerhof <Cecil@decebal.nl> - 2015-04-30 16:53 +0200
      Re: Let exception fire or return None Cecil Westerhof <Cecil@decebal.nl> - 2015-04-30 14:22 +0200
  Re: Let exception fire or return None Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-04-30 14:05 +0200
  Re: Let exception fire or return None Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2015-04-30 14:30 +0200

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