On 10/11/05, Eyal Lotem [EMAIL PROTECTED] wrote:
locals()['x'] = 1 # Quietly fails!
Replaced by:
frame.x = 1 # Raises error
What about the possibility of making this hypothetic frame object an
indexable, such that frame[0] is the current scope, frame[1] is the
calling scope, etc.?
[Jeremy]
Neil and I have been working on the AST branch for the last week.
We're nearly ready to merge the changes to the head.
[Raymond]
Nice work.
Indeed. I should've threatened to kill the AST branch long ago! :)
--
--Guido van Rossum (home page: http://www.python.org/~guido/)
Phillip J. Eby wrote:
I meant that just changing its class is a mutation, and since immutables
can be shared or cached, that could lead to problems. So I do think
it's a reasonable implementation limit to disallow changing the
__class__ of an immutable.
That's a fair point.
Although I
Sokolov Yura wrote:
May be allow modules to define __getattr__ ?
I think I like the descriptor idea better. Besides
being more in keeping with modern practice, it would
allow for things like
from autoloading import autoload
Foo = autoload('foomodule', 'Foo')
Blarg =
Tony Nelson wrote:
I have written my fastcharmap decoder and encoder. It's not meant to be
better than the patch and other changes to come in a future version of
Python, but it does work now with the current codecs.
It's an interesting solution.
To use, hook each codec to be speed up:
Phillip J. Eby wrote:
A more
compact scheme is possible, by using two tables - a bytecode-line
number table, and a line number- file table.
If you have to encode multiple files, you just offset their line numbers
by the size of the other files,
More straightforwardly, the second
Calvin Spealman [EMAIL PROTECTED] wrote:
On 10/11/05, Eyal Lotem [EMAIL PROTECTED] wrote:
locals()['x'] = 1 # Quietly fails!
Replaced by:
frame.x = 1 # Raises error
What about the possibility of making this hypothetic frame object an
indexable, such that frame[0] is the
On 10/13/05, Guido van Rossum [EMAIL PROTECTED] wrote:
Indeed. I should've threatened to kill the AST branch long ago! :)
:-)
I decreased a lot of the memory leaks. Here are some more to work on.
I doubt this list is complete, but it's a start:
PyObject_Malloc (obmalloc.c:717)
On 10/14/05, Neal Norwitz [EMAIL PROTECTED] wrote:
I decreased a lot of the memory leaks. Here are some more to work on.
I doubt this list is complete, but it's a start:
Oh and since I fixed the memory leaks in a generated file
Python/Python-ast.c, the changes still need to be implemented in
Phillip J. Eby [EMAIL PROTECTED] writes:
Even better if the lines for a particular piece of code don't have
to all come from the same file.
This seems _fairly_ esoteric to me. Why do you need it?
I can think of two uses for lnotab information: printing source lines
and locating source lines
Phillip J. Eby [EMAIL PROTECTED] writes:
At 09:23 AM 10/14/2005 +0100, Michael Hudson wrote:
Phillip J. Eby [EMAIL PROTECTED] writes:
Even better if the lines for a particular piece of code don't have
to all come from the same file.
This seems _fairly_ esoteric to me. Why do you need it?
Walter Dörwald wrote:
We've already taken care of decoding. What we still need is a new
gencodec.py and regenerated codecs.
I'll take care of that; just haven't gotten around to it yet.
--
Marc-Andre Lemburg
eGenix.com
Professional Python Services directly from the Source (#1, Oct 14 2005)
Sokolov Yura wrote:
May be allow modules to define __getattr__ ?
def __getattr__(thing):
try:
return __some_standart_way__(thing)
except AttributeError:
if thing==Queue:
import sys
from Queue import Queue
Even better if the lines for a particular piece of code don't
have
to all come from the same file.
This seems _fairly_ esoteric to me. Why do you need it?
Compilers that inline function calls, but want the code to still be
debuggable. AOP tools that weave bytecode. Overloaded
I ran across an interesting paper about some VM optimizations yesterday:
http://www.object-arts.com/Papers/TheInterpreterIsDead.PDF
One thing mentioned was that saving even one cycle in their 'PUSH_SELF'
opcode improved interpreter performance by 5%. I thought that was pretty
cool, and
[Michael Hudson]
Phillip J. Eby [EMAIL PROTECTED] writes:
Even better if the lines for a particular piece of code don't have
to all come from the same file.
This seems _fairly_ esoteric to me. Why do you need it?
For when Python code is generated from more than one original source
file
[Raymond Hettinger]
Even better if the lines for a particular piece of code don't
have to all come from the same file.
YAGNI
I surely needed it, more than once. Don't be so assertive. :-)
--
François Pinard http://pinard.progiciels-bpi.ca
At 02:41 PM 10/14/2005 -0400, Raymond Hettinger wrote:
YAGNI
If the feature were there, I'd have used it already, so I wouldn't consider
it YAGNI. In the cases where I would've used it, I instead split generated
code into separate functions so I could compile() each one with a different
Phillip Indeed, even pystone doesn't do much attribute access on the
Phillip first argument of most of its functions, especially not those
Phillip in inner loops. Only Proc1() and the Record.copy() method do
Phillip anything that would be helped by SELF_ATTR. But it seems to me
Walter Dörwald wrote:
Of course we can't accept Pyrex code in the Python core, so it would be
great to rewrite the encoder as a patch to PyUnicode_EncodeCharmap().
This version must be able to cope with encoding tables that are random
strings without crashing.
I don't think this will be
Phillip J. Eby wrote:
Anyway, my main question is, do these sound like worthwhile
optimizations?
In the past, I think the analysis was always no. It adds
an opcode, so increases the size of the switch, causing
more pressure on the cache, with an overall questionable
effect.
As for measuring
At 12:33 AM 10/15/2005 +0200, Martin v. Löwis wrote:
Phillip J. Eby wrote:
Anyway, my main question is, do these sound like worthwhile
optimizations?
In the past, I think the analysis was always no. It adds
an opcode, so increases the size of the switch, causing
more pressure on the cache,
Sorry I can't reply to the message (I'm at home, and don't currently have
python-dev sent there).
I have a version of Raymond's constant binding recipe:
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/277940
that also binds all attribute accesses all the way down into a single
constant
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