[Python-ideas] except expression

[M.-A. Lemburg]

On 13.02.2014 10:24, Nick Coghlan wrote:
> General comment: like Raymond, I'm inclined to favour a nice expression
> friendly exception handling syntax, precisely because of the proliferation
> of relatively ad hoc alternative solutions (in particular, the popularity
> of being able to pass in default values to handle empty iterables).

Here's a variant the resembles the code you'd write in a helper
function to achieve the same thing, only stripped down somewhat:

x = something() except ValueError return default_value

def try_something():
    try:
        return something()
    except ValueError:
        return default_value

x = something() except ValueError as exc return exc.message

def try_something():
    try:
        return something()
    except ValueError as exc
        return exc.message

Obviously, having a keyword "use" would make a better fit :-)

x = something() except ValueError use default_value

-- 
Marc-Andre Lemburg
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