On 2020-12-07, Chris Angelico <ros...@gmail.com> wrote:
> On Tue, Dec 8, 2020 at 6:41 AM Grant Edwards <grant.b.edwa...@gmail.com>
> wrote:
>> On 2020-12-07, MRAB <pyt...@mrabarnett.plus.com> wrote:
>> > Avoid a 'bare' except unless you _really_ mean it, which is
>> > virtually never. Catch only those exceptions that you're going to
>> > handle.
>>
>> And sometimes "handling" is just printing some extra stuff and then
>> re-raising the original exception:
>>
>> try:
>> something():
>> except:
>> print(<whatever might be helpful for troubleshooting>)
>> raise
>>
>
> Even there, I'd most often use "except BaseException as e:", other
> than in a very few situations. The only time I have recently used a
> bare except is when making use of the traceback module:
>
> try:
> ...
> except:
> with open("notes.err", "a") as err:
> traceback.print_exc(file=err)
> raise
>
> since print_exc() can go fetch the exception via sys.exc_info().
... but even if you do think you want "except BaseException:" or
"except:", you almost never actually do - you almost certainly want
"except Exception:", because the former two will stop sys.exit()
from working, or the user from pressing ctrl-C.
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