[Python-Dev] PEP 0008 confusion - here it is, but don't use it?

[Phillip J. Eby]

At 02:01 PM 8/6/04 -0500, Skip Montanaro wrote:
>For example, do not rely on CPython's efficient implementation
>       of in-place string concatenation for statements in the form a+=b or
>       a=a+b.  Those statements run more slowly in Jython.

Is that really true?  I thought the last time this came up, somebody said 
that common Java implementations actually had special case code to speed up 
string concatenation.