[Python-ideas] Comparable exceptions (original) (raw)

Steven D'Aprano steve at pearwood.info
Wed Feb 25 14:32:46 CET 2015

On Wed, Feb 25, 2015 at 03:03:40PM +0200, Ionel Cristian Mărieș wrote:

Yes, it does, however my assertion looks similar to this:

assert result == [1,2, (3, 4, {"bubu": OSError('foobar')})]

I'm not keen on using assert like that. I think that using assert for testing is close to abuse of the statement, and it makes it impossible to test your code running with -O.

But regardless of whether that specific test is good practice or not, I think it is reasonable for exception instances to have a more useful eq than that provided by inheriting from object. Perhaps add something like this to BaseException:

def __eq__(self, other):
    if isinstance(other, type(self)):
        return self.args == other.args
    return NotImplemented

-- Steve

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