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Re: The Most Diabolical Python Antipattern

From Marko Rauhamaa <marko@pacujo.net>
Newsgroups comp.lang.python
Subject Re: The Most Diabolical Python Antipattern
Date 2015-01-30 12:00 +0200
Organization A noiseless patient Spider
Message-ID <87fvaslh9h.fsf@elektro.pacujo.net> (permalink)
References (1 earlier) <20150129113238.7eaa986d@bigbox.christie.dr> <mailman.18286.1422571931.18130.python-list@python.org> <87r3uchjyg.fsf@elektro.pacujo.net> <mailman.18296.1422605482.18130.python-list@python.org> <87r3ucljyv.fsf@elektro.pacujo.net>

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Marko Rauhamaa <marko@pacujo.net>:

>>> Surprisingly this variant could raise an unexpected exception:
>>>
>>> ==============================
>>>      try:
>>>          do_interesting_stuff()
>>>      except ValueError:
>>>          try:
>>>              log_it()
>>>          finally:
>>>              raise
>>> ==============================
>>>
>>> A Python bug?
> [...]
> My Python did do exception chaining, but the problem is the surface
> exception changes, which could throw off the whole error recovery.

BTW, the code above can be fixed:

==============================
  try:
      do_interesting_stuff()
  except ValueError as e:
      try:
          log_it()
      finally:
          raise e
==============================

Now the surface exception is kept and the subsidiary exception is
chained to it.

I'm a bit baffled why the two pieces of code are not equivalent.


Marko

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Thread

Re: The Most Diabolical Python Antipattern Ian Kelly <ian.g.kelly@gmail.com> - 2015-01-29 15:51 -0700
  Re: The Most Diabolical Python Antipattern Marko Rauhamaa <marko@pacujo.net> - 2015-01-30 08:16 +0200
    Re: The Most Diabolical Python Antipattern Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-01-30 08:10 +0000
      Re: The Most Diabolical Python Antipattern Marko Rauhamaa <marko@pacujo.net> - 2015-01-30 11:02 +0200
        Re: The Most Diabolical Python Antipattern Ian Kelly <ian.g.kelly@gmail.com> - 2015-01-30 02:17 -0700
        Re: The Most Diabolical Python Antipattern Marko Rauhamaa <marko@pacujo.net> - 2015-01-30 12:00 +0200
          Re: The Most Diabolical Python Antipattern Ian Kelly <ian.g.kelly@gmail.com> - 2015-01-30 08:21 -0700
            Re: The Most Diabolical Python Antipattern Marko Rauhamaa <marko@pacujo.net> - 2015-01-30 17:30 +0200
              Re: The Most Diabolical Python Antipattern Ian Kelly <ian.g.kelly@gmail.com> - 2015-01-30 08:42 -0700
                Re: The Most Diabolical Python Antipattern Marko Rauhamaa <marko@pacujo.net> - 2015-01-30 17:56 +0200
                Re: The Most Diabolical Python Antipattern Ian Kelly <ian.g.kelly@gmail.com> - 2015-01-30 09:38 -0700
              Re: The Most Diabolical Python Antipattern Chris Angelico <rosuav@gmail.com> - 2015-01-31 02:55 +1100
    Re: The Most Diabolical Python Antipattern Ian Kelly <ian.g.kelly@gmail.com> - 2015-01-30 02:11 -0700
    Re: The Most Diabolical Python Antipattern Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-01-31 01:28 +0000

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