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To: python-list@python.org
From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: I love assert
Date: Wed, 12 Nov 2014 03:29:13 -0500
References: <96c138e4-ab95-4e5f-a0c8-e696b5a926bb@googlegroups.com> <m3u2tq$2sa$1@ger.gmane.org> <857fz173ko.fsf@benfinney.id.au>
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On 11/11/2014 5:52 PM, Ben Finney wrote:
> Terry Reedy <tjreedy@udel.edu> writes:
>
>> We love 'assert' so much that we have 20-30 'assertXYZ' variations in
>> unittest.
>
> A function will not be disabled by a run-time option to the Python
> interpreter.
>
>> The statement 'assert expression' is almost equivalent to
>>
>> if not expression: raise AssertionError('expression')
>
> With the important difference that this will be active no matter what
> options Python's interpreter is run with. That makes it quite a
> different proposition from using =E2=80=98assert=E2=80=99 statements.

Which importand difference I pointed out (and you snipped) as a reason=20
to seldom use bare assert.

--=20
Terry Jan Reedy