On 08/25/2015 03:36 PM, Alexander Belopolsky wrote:
>
> On Tue, Aug 25, 2015 at 5:28 PM, Carl Meyer <carl@oddbird.net
> <mailto:carl@oddbird.net>> wrote:
>>
>> My answer is "only in those same locations where the fold attribute
>> would otherwise be checked in order to resolve an ambiguity."
>
>
> This includes utcoffset() which is used in datetime.__eq__.  What should
> __eq__ do if utcoffset() raises AmbiguousTimeError?  Unpatched, it will
> propagate the exception resulting in for example x in [y, x, x, x]
> raising an error whenever y happened to be fold=-1 ambiguous.  Is your
> code prepared to handle  AmbiguousTimeError whenever you search for a
> date in a list?  Does it check for fold != -1 before adding a date to a
> list?

This is a good question. I can see two defensible choices: