On Mon, Sep 14, 2015 at 3:30 PM, Tim Peters <tim.pet...@gmail.com> wrote:
> > make it much cheaper to maintain global invariants like a sort order > > according to the UTC value > > It would be nice to have! .utcoffset() is an expensive operation > as-is, and being able to rely on tm_gmtoff would make that dirt-cheap > instead. If it is just a question of optimization, datetime objects can be extended to cache utcoffset. Note that PyPy have recently added caching of the hash values in datetime objects. I merged their changes in our datetime.py, but it did not look like C implementation would benefit from it as much as pure python did. I expect something similar from caching utcoffset: a measurable improvement for tzinfos implemented in Python and a wash for those implemented in C. (A more promising optimization approach is to define a C API for tzinfo interface.)
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