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

Ionel Cristian Mărieș contact at ionelmc.ro
Wed Feb 25 14:03:40 CET 2015

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$'): dosomething()

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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