The Most Diabolical Python Antipattern

Fri Jan 30 04:02:32 EST 2015

Mark Lawrence <breamoreboy at yahoo.co.uk>:
> On 30/01/2015 06:16, Marko Rauhamaa wrote:
>> How about:
>>>> ==============================
>> try:
>> do_interesting_stuff()
>> except ValueError:
>> try:
>> log_it()
>> except:
>> pass
>> raise
>> ==============================
>>>> Surprisingly this variant could raise an unexpected exception:
>>>> ==============================
>> try:
>> do_interesting_stuff()
>> except ValueError:
>> try:
>> log_it()
>> finally:
>> raise
>> ==============================
>>>> A Python bug?
>> It depends on the Python version that you're running - I think!!! See
> https://www.python.org/dev/peps/pep-3134/

TL;DR
My Python did do exception chaining, but the problem is the surface
exception changes, which could throw off the whole error recovery.
So I'm thinking I might have found a valid use case for the "diabolical
antipattern."
Marko