[Python-Dev] Lockstep iteration - eureka! (original) (raw)

Ka-Ping Yee ping@lfw.org
Wed, 9 Aug 2000 02:37:07 -0700 (PDT)

On Wed, 9 Aug 2000, Greg Ewing wrote:

for (x in a, y in b): ...

It looks nice, but i'm pretty sure it won't fly. (x in a, y in b) is a perfectly valid expression. For compatibility the parser must also accept

for (x, y) in list_of_pairs:

and since the thing after the open-paren can be arbitrarily long, how is the parser to know whether the lockstep form has been invoked?

Besides, i think Guido has Pronounced quite firmly on zip().

I would much rather petition now to get indices() and irange() into the built-ins... please pretty please?

-- ?!ng

"All models are wrong; some models are useful." -- George Box