Let exception fire or return None

Dave Angel davea at davea.name
Thu Apr 30 10:18:06 CEST 2015

On 04/30/2015 03:43 AM, Cecil Westerhof wrote:
> 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.

Fire an exception.

One advantage is that the exception will pinpoint exactly which line of 
the function had a problem.


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