[Python-ideas] Repurpose `assert' into a general-purpose check
vano at mail.mipt.ru
Mon Nov 27 23:35:45 EST 2017
On 28.11.2017 6:34, Ned Batchelder wrote:
> You are proposing:
> assert condition, type, value
Not specifically this, that's just an example.
Actually, the way I'm using them,
assert condition, "error message", type
would probably be the most expressive way.
> Why not just use Python as it is now, with this:?
It's the most expressive way the language provides to write that logic.
With Python's design focus on promoting expressive, readable and
intuitive syntax, that's enough of a reason.
> if not condition: raise type(value)
> I don't see a reason to change the assert statement. You can do what
> you need without the change.
I can do anything in any Turing-complete language without any changes to
the language. That's no reason to never change anything, is it.
The rationale basically is:
* As it was intended, the statement has no practical use -- basically a
rudiment, due to disappear eventually
* It can instead be reused as syntax sugar to cover a very common use case
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