[Datetime-SIG] Another round on error-checking

[Carl Meyer]

On 08/31/2015 11:58 AM, Tim Peters wrote:
> I think I'd rather acknowledge that problem cases exist in a direct
> and straightforward way, by adding a new tzinfo (say).classify()
> method.  For example, .classify() could return a
> 
>     (kind, detail)
> 
> 2-tuple.

FWIW, regardless of the question of `utcoffset()` raising exceptions,
the addition of this `classify()` method alone would resolve every use
case I've ever had for pytz's `is_dst=None` strict ambiguity handling.

Carl

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