On 12/02/2013 21:03, Maciej Fijalkowski wrote:
We recently encountered a performance issue in stdlib for pypy. It turned out that someone commited a performance "fix" that uses += for strings instead of "".join() that was there before.
I fixed a performance bug in httplib some years ago by doing the exact opposite; += -> ''.join(). In that case, it changed downloading a file from 20 minutes to 3 seconds. That was likely on Python 2.5.
How people feel about generally not having += on long strings in stdlib (since the refcount = 1 thing is a hack)?
+1 from me.