[Python-ideas] except expression

[Amber Yust]

Actually. What if we just reused 'try'?

    foo = bar() except BazException try 'qux'

This also leads naturally to chaining multiple possible fallbacks:

    foo = bar() except BarException try baz() except BazException try None

On Thu Feb 13 2014 at 10:32:16 AM, David Mertz <mertz at gnosis.cx> wrote:

> On Thu, Feb 13, 2014 at 3:25 AM, spir <denis.spir at gmail.com> wrote:
>
> Of course, it could be done as a function call:
>
> def catch(callme, catchme, returnme):
>    try:
>      return callme()
>    except catchme:
>      return returnme
>
> phone = catch(lambda: addressbook[name], KeyError, "Unknown")
> but that's *really* clunky.
>
>
> I don't really find this function all the clunky.  However, it also does
> not solve the case of an expensive 'except' clause that Nick pointed out as
> desirable to avoid evaluating (or, for that matter, an except clause with
> side effects).
>
> E.g.
>
>   phone = catch(lambda: addressbook[name], KeyError,
> lookup_from_internet(name))
>
>
>
>
> --
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