[Python-Dev] PEP 201, zip() builtin
Greg Ewing
greg at cosc.canterbury.ac.nz
Fri Jul 28 00:28:47 EDT 2000
bwarsaw at beopen.com (Barry A. Warsaw):
> An earlier version of this PEP proposed that
> zip() return a built-in object that performed lazy evaluation
> using __getitem__() protocol. This has been strongly rejected
> by the BDFL in favor of returning a real Python list. If lazy
> evaluation is desired in the future, the BDFL suggests an xzip()
> function be added.
Well, in that case I think the BDFL has just shot this
proposal in the foot as far as being a serious solution
to the parallel for loop problem.
I was willing to live with the idea of using zip() instead
of having a proper parallel iteration syntax, as long as
it was implemented lazily. But now it seems I'll have to
use another ugly x-named function all over the place.
How about calling the lazy version tuples(), so we can
say
for x,y in tuples(a,b):
which ought to be a whack of a load more intuitively
readable than
for x,y in xzip(a,b):
Greg Ewing, Computer Science Dept, +--------------------------------------+
University of Canterbury, | A citizen of NewZealandCorp, a |
Christchurch, New Zealand | wholly-owned subsidiary of USA Inc. |
greg at cosc.canterbury.ac.nz +--------------------------------------+
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