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[Python-Dev] Performance of u()

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On Sat, 25 Feb 2012 19:13:26 -0800Guido van Rossum <guido at python.org> wrote:> If this can encourage more projects to support Python 3 (even if it's> only 3.3 and later) and hence improve adoption of Python 3, I'm all> for it.>> A small quibble: I'd like to see a benchmark of a 'u' function implemented in C.Even without implementing it in C, caching the results makes it muchless prohibitive in tight loops:if sys.version_info >= (3, 0):    def u(value):        return valueelse:    def u(value, _lit_cache={}):        if value in _lit_cache:            return _lit_cache[value]        s = _lit_cache[value] = unicode(value, 'unicode-escape')        return su'\N{SNOWMAN}barbaz'   -> 100000000 loops, best of 3: 0.00928 usec per loopu('\N{SNOWMAN}barbaz') -> 10000000 loops, best of 3: 0.15 usec per loopu'foobarbaz_%d' % x    -> 1000000 loops, best of 3: 0.424 usec per loopu('foobarbaz_%d') % x  -> 1000000 loops, best of 3: 0.598 usec per loopRegardsAntoine.

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