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