[Python-Dev] A `cogen' module - an observation

[Greg Ewing]

> [f(x, y) for x in X for y in Y] 
> 
>   is equivalent to:
> 
> [f(x, y) for x, y in cartesian(X, Y)] 

Hmmm, in other words, cartesian() is a lazy version
of zip().

(Given its intended use, I always thought zip()
should have been lazy from the beginning, but
the BDFL thought otherwise.)

Greg Ewing, Computer Science Dept, +--------------------------------------+
University of Canterbury,	   | A citizen of NewZealandCorp, a	  |
Christchurch, New Zealand	   | wholly-owned subsidiary of USA Inc.  |
greg@cosc.canterbury.ac.nz	   +--------------------------------------+