[Python-ideas] except expression

[Rob Cliffe]

On 18/02/2014 15:26, Alexander Belopolsky wrote:
>
> On Tue, Feb 18, 2014 at 10:13 AM, MRAB <python at mrabarnett.plus.com 
> <mailto:python at mrabarnett.plus.com>> wrote:
> >
> > Another possibility would be to say that a bare except in an expression
> > catches only certain "expression-oriented" exceptions, e.g. ValueError.
> > The simplest way to do that would be to make them subclasses of an
> > ExpressionError class.
>
>
> +1
>
> >
> > The question then becomes one of which
> > exceptions are "expression-oriented"...
>
> Here is my attempt to answer:
>
> - ArithmeticError
> - AttributeError
> - LookupError
> - TypeError ?
> - ValueError ?
>
>
Sorry, but this seems to me to be a futile discussion.
Expressions can contain functions.
Functions can raise any exception they like.
So evaluating an expression can raise any exception you care to name.
Rob Cliffe
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