Guido van Rossum wrote:
Greg seem to be +0 or better for (a)
Actually, I'm closer to -1 on (a) as well. I don't like := as a way of getting assignment in an expression. The only thing I would give a non-negative rating is some form of "where" or "given".
Brief summary of reasons for disliking ":=":
* Cryptic use of punctuation
* Too much overlap in functionality with "="
* Asymmetry between first and subsequent uses of the bound value
* Makes expressions cluttered and hard to read to my eyes