[openstack-dev] [Review] Use of exception for non-exceptional cases
dripton at redhat.com
Wed Jul 10 19:57:19 UTC 2013
On 07/10/2013 02:01 PM, Nachi Ueno wrote:
> HI folks
> I would like to ask the review criteria in the community.
> Should we use exception for non-exceptional cases when we can use
> parameter checking?
> Example1: Default value for array index
> value = list
> except IndexError:
> value = 'default_value'
> This can be also written as,
> list_a if len(list_a) > 3 else 'default_value'
Both of these are fine. Neither deserves to be banned.
But LBYL is often naive in the face of concurrency. Just because
something was true a microsecond ago doesn't mean it's still true.
Exceptions are often more robust.
David Ripton Red Hat dripton at redhat.com
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