On 2012-06-19, at 9:22 PM, Yury Selivanov wrote:
> On 2012-06-19, at 8:39 PM, Nick Coghlan wrote:
>> 7. The idea of immutable Signature objects does highlight an annoyance
>> with the "attribute may be missing" style APIs. To actually duplicate
>> a signature correctly, including its return annotation (and assuming
>> the attribute is renamed), you would have to do something like:
>>
>> try:
>> note = {"annotation": old_sig.annotation}
>> except AttributeError:
>> note = {}
>> new_sig = Signature(old_sig.parameters[1:], **note)
BTW, we don't have slices for OrderedDict. Since the slice object is
not hashable, we can implement it safely. I can create an issue (and draft
implementation), as I think it'd be quite a useful feature.
-
Yury
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