[Tutor] please return flys in ointment

[Jim Mooney]

On 8 July 2013 00:12, Steven D'Apranocatching ArithmeticError

> further on), please use a custom exception
>

Well, an Arithmetic Error was better than bubbling up to a totally general
one. I'm not sure how do custom error code. Short example, please ;')

Jim
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