[Python-Dev] Re: [Python-checkins] python/dist/src/Lib/test test_string.py, 1.25, 1.26 (original) (raw)

Nick Coghlan ncoghlan at iinet.net.au
Fri Aug 27 01:20:15 CEST 2004

Walter Dörwald wrote:

I'm working on it, however I discovered that unicode.join() doesn't optimize this special case:

I noticed that during the implementation of the patch. I think it's because unicode join doesn't use a multi-pass approach, so there's no opportunity to notice that the optimisation is possible.

s = "foo" assert "".join([s]) is s

u = u"foo" assert u"".join([s]) is s The second assertion fails. I'd say that this test (joining a one item sequence returns the item itself) should be removed because it tests an implementation detail.

Fine by me - I was uncertain about that when I posted the patch to SF (there's a question about it in the patch tracker item). The main reason I had that test there was to make sure that the second version of the patch didn't break this optimisation the way the first version did.

Regards, Nick.

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