[Python-ideas] Comparable exceptions

[Ionel Cristian Mărieș]

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

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

I could implement my own "reliable_compare" function but I'd rather not do
that, as it seems like a workaround.



Thanks,
-- Ionel Cristian Mărieș, blog.ionelmc.ro

On Wed, Feb 25, 2015 at 1:57 AM, Ryan Gonzalez <rymg19 at gmail.com> wrote:

> Doesn't unittest already cover this?
>
> with self.assertRaisesRegexp(OSError, '^foobar$'):
>     do_something()
>
>
> On Tue, Feb 24, 2015 at 5:43 PM, Ionel Cristian Mărieș <contact at ionelmc.ro
> > wrote:
>
>> Hey everyone,
>>
>> I was writing a test the other day and I wanted to assert that some
>> function raises some exception, but with some exact value. Turns out you
>> cannot compare OSError("foobar") to OSError("foobar") as it doesn't have
>> any __eq__. (it's the same for all exceptions?)
>>
>> I think exceptions are great candidates to have an __eq__ method - they
>> already have a __hash__ (that's computed from the contained values) and
>> they are already containers in a way (they all have the `args` attribute).
>>
>> Comparing exceptions in a test assertion seems like a good usecase for
>> this.
>>
>> Thanks,
>> -- Ionel Cristian Mărieș, blog.ionelmc.ro
>>
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>
>
>
> --
> Ryan
> If anybody ever asks me why I prefer C++ to C, my answer will be simple:
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> nul-terminated."
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> srean
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>
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