Hello Raymond, On Mon, Aug 02, 2004 at 10:24:03PM -0400, Raymond Hettinger wrote: > The explanation is not hard. The CPython implementation can concatenate > inplace two term expressions of the form a=a+b or a+=b. Expressions > with more terms are not eligible for inplace concatenation. No: a+=b+c is eligible. That's my problem. Armin