[issue15873] datetime: add ability to parse RFC 3339 dates and times

[Mathieu Dupuy]

Mathieu Dupuy added the comment:

SilentGhost: the dictionary single dispatch thing attached (apply on top of the last, fromisoformat_new3).
I mind the performance penalty for date-only parsing users, but the code is definitively shorter and more elegant.

But we have a major problem: tests fails because what is used in tests is a subclass of datetime classes (Subclass[Date|Time|DateTime]) and thus, the dispatch break with a KeyError: class.SubDate[...]. I have no idea on how mitigate that. Do you ?

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<http://bugs.python.org/issue15873>
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