STINNER Victor added the comment:

> I'm surprised that this has given such large effect. ;) I hoped only on more 
> clear code.

To be honest, I expected shorter code but worse performances using 
_PyUnicodeWriter_WriteASCIIString().

dict_repr() was not really super fast: it did call PyUnicode_FromString() at 
each call to decode ": " and ", " from UTF-8. list_repr() and tuplerepr() kept 
", " separator cached in a static variable. This is probably why the code is 
now faster.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue19646>
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