One Python 2.1 idea

Rainer Deyke root at rainerdeyke.com
Mon Dec 25 17:48:25 CET 2000


<rturpin at my-deja.com> wrote in message news:927q24$ond$1 at nnrp1.deja.com...
> In article <mailman.977737448.26875.python-list at python.org>,
> Yes, this is a good performance optimization. BUT it
> requires NO CHANGE in how loops are written. The WRONG
> way to do this is to provide another construct in the
> language, making it more complex, but giving it no
> more expressive power. The RIGHT way to do this is
> for the compiler to recognize the common construct:
>
>     for i in range(<exp1>: <exp2>):
>
> The compiler then generates efficient byte code that
> does precisely what you describe. It can generate a
> minimal "ghost" of a list for the iteration, because
> there is no way that future code can do anything else
> with that list.

_range = range
ranges = []

def my_range(*args):
  r = _range(*args)
  global ranges
  ranges.append(r)

__builtins__.range = my_range


--
Rainer Deyke (root at rainerdeyke.com)
Shareware computer games           -           http://rainerdeyke.com
"In ihren Reihen zu stehen heisst unter Feinden zu kaempfen" - Abigor





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