string repr in 2.1

[Michael Hudson]

Michael Hudson <mwh at python.net> writes:

> Robin Becker <robin at jessikat.fsnet.co.uk> writes:
> 
> 
> > On related notes if repr no longer does octal escapes does string
> > input still accept them?
> 
> Yes!  Upgrading isn't meant to be *that* much of an adventure.
> 
> > Also my trial of the 2.0 code versus an initial 2.1 coding reveals
> > that an re based approach is very slow :( Anyone know simply what's
> > involved in doing a codec?
> 
> Try this instead:
> 
> def _make_dict():
>     d = {}
>     for c in range(ord(' ')) + range(0x7F,0xFF):
                                            ^^^^
This should be 0x100, sorry.

[snip]
> It can be rewritten in C if you're really keen, when it'll probably
> run somewhat faster than _escape20

It does:

Time for 1000x4 uses of <function _escape20 at 0x8124b54> = 0.54"
Time for 1000x4 uses of <function _escape21 at 0x8121914> = 2.28"
Time for 1000x4 uses of <function _escape21_mwh at 0x80cb99c> = 0.84"
Time for 1000x4 uses of <function <lambda> at 0x8124b1c> = 0.33"

(and that's not optimal because the C function I borrowed (from
pyrepl) does more work; could probably get it down to about 0.20").

Cheers,
M.

-- 
  MAN:  How can I tell that the past isn't a fiction designed to
        account for the discrepancy between my immediate physical
        sensations and my state of mind?
                   -- The Hitch-Hikers Guide to the Galaxy, Episode 12