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Alex Gaynor alex.gay...@gmail.com added the comment:
Yes, this is known as catastrophic backtracking, and there isn't really a
solution for it, some regexps can't be efficiently matched.
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New submission from Alex Gaynor alex.gay...@gmail.com:
This is related to the discussion we had at the PyCon language summit about C
vs Python function binding. If you create a partial instance and put it on a
class it doesn't create bound instances. This behavior is a tad surprising in
my
Alex Gaynor alex.gay...@gmail.com added the comment:
Indeed I completely missed the section at the bottom. A note in the above
section would be a useful addition.
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Alex Gaynor alex.gay...@gmail.com added the comment:
FWIW in PyPy we have
https://bitbucket.org/pypy/pypy/src/default/lib_pypy/disassembler.py which we
use for some of our tools.
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Alex Gaynor alex.gay...@gmail.com added the comment:
The C standard (and/or the POSIX one, I forget) says sqrt(-0.0) returns -0.0.
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Alex Gaynor alex.gay...@gmail.com added the comment:
It returns PyPy on pypy.
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Alex Gaynor alex.gay...@gmail.com added the comment:
Why not use Py_EnterRecursiveCall?
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Alex Gaynor alex.gay...@gmail.com added the comment:
This bug tracker is for filing bugs in Python itself, for support with 3rd
party libraries you should try their mailing lists or IRC channels.
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resolution: - invalid
status: open - closed
Alex Gaynor alex.gay...@gmail.com added the comment:
I don't see why this is incorrect, type(a) - type, and object is a superclass
of type.
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Alex Gaynor alex.gay...@gmail.com added the comment:
These feel like a shell injection waiting to happen to me.
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Alex Gaynor alex.gay...@gmail.com added the comment:
This already exists, as functools.partial:
http://docs.python.org/library/functools.html#functools.partial
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New submission from Alex Gaynor alex.gay...@gmail.com:
I don't have a particularly minimal test case for this, however I am able to
reproduce it consistently (so far reproduced on multiple machines, 32-bit and
64-bit on 2.6 and 2.7), using these steps:
First get a checkout of the PyPy
Alex Gaynor alex.gay...@gmail.com added the comment:
Antoine asked for a gdb bt, here's the last couple of useful frames:
#0 _PyWeakref_ClearRef (self=0x4000) at Objects/weakrefobject.c:97
#1 0x004d4c66 in handle_weakrefs (old=0x78a2b0,
unreachable=0x7fff87b0
Alex Gaynor alex.gay...@gmail.com added the comment:
Turns out this was a subtle bug in some raw memory manipulation code, which
amaury spotted.
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New submission from Alex Gaynor alex.gay...@gmail.com:
In 2.7 ast.literal_eval blows up with a set for input:
import ast
ast.literal_eval({1})
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messages: 148897
nosy: alex
priority: low
severity: normal
status: open
title: ast.literal_eval fails on sets
versions: Python 2.7
Alex Gaynor alex.gay...@gmail.com added the comment:
Patch with tests
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Added file: http://bugs.python.org/file23859/x.diff
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Alex Gaynor alex.gay...@gmail.com added the comment:
There's no support for comprehensions of any sort, and confusingly limited
support for arithmetic ops, I'd like to keep the scope of this issue small,
basically backporting 90bf0631bfb8 and adding the tests (which I can also add
to default
Alex Gaynor alex.gay...@gmail.com added the comment:
I'll chip in my 2 cents as well and say this also seems too domain specific and
not useful enough for the stdlib.
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Alex Gaynor alex.gay...@gmail.com added the comment:
Raymond, Antoine: I don't see your claims as contradictory, it's definitely
true that the Python standardlib has historically tried to keep reprs as being
eval-able, I think Antoine's correct that the vast majority of 3rd-party code
does
Alex Gaynor alex.gay...@gmail.com added the comment:
For what it's worth I proposed this on -ideas a while ago, the sticking points
were what does `not in` do (no one had an answer anyone was happy with for
this), and do we need a way to override it from the other perspective (e.g. if
I want
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Alex Gaynor alex.gay...@gmail.com added the comment:
Except, it's a totally non-scalable approach. People have vulnerabilities all
over their sites which they don't realize. Some examples:
django-taggit (an application I wrote for handling tags) parses tags out an
input, it stores
Alex Gaynor alex.gay...@gmail.com added the comment:
Perl is so paranoid they obscure their variable names! In all seriousness,
both Perl and Ruby are vulnerable to the timing attacks, and as far as I know
the JVM is not patching this themselves, but telling applications to fix it
themselves
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Alex Gaynor alex.gay...@gmail.com added the comment:
You're seriously underestimating the number of vulnerable dicts. It has
nothing to do with the module, and everything to do with the origin of the
data. There's tons of user code that's vulnerable too
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Alex Gaynor alex.gay...@gmail.com added the comment:
Django's tests will *not* be run with HASHEED=0, if they're broken with hash
randomization then they are likely broken on random.choice([32-bit, 64-bit,
pypy, jython, ironpython]) and we strive to run on all those platforms.
If our tests
Alex Gaynor alex.gay...@gmail.com added the comment:
On Sat, Jan 21, 2012 at 5:42 PM, Gregory P. Smith rep...@bugs.python.orgwrote:
Gregory P. Smith g...@krypto.org added the comment:
On Sat, Jan 21, 2012 at 2:45 PM, Antoine Pitrou rep...@bugs.python.org
wrote:
Antoine Pitrou pit
New submission from Alex Gaynor alex.gay...@gmail.com:
ATM there's no tests (at least in 2.x, I haven't checked 3.x yet) for this
behavior:
os.path.exists(/tmp\x00abcds)
Traceback (most recent call last):
File stdin, line 1, in module
File /usr/lib/python3.2/genericpath.py, line 18
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Alex Gaynor alex.gay...@gmail.com added the comment:
On Wed, Jan 25, 2012 at 7:45 AM, Dave Malcolm rep...@bugs.python.orgwrote:
Dave Malcolm dmalc...@redhat.com added the comment:
I've found a bug in my patch; insertdict writes the old non-randomized
hash value into me_hash at:
ep
Alex Gaynor alex.gay...@gmail.com added the comment:
On Thu, Jan 26, 2012 at 4:00 PM, Martin v. Löwis rep...@bugs.python.orgwrote:
Martin v. Löwis mar...@v.loewis.de added the comment:
I'd like to propose an entirely different approach: use AVL trees for
colliding strings, for dictionaries
Alex Gaynor alex.gay...@gmail.com added the comment:
On Thu, Jan 26, 2012 at 5:42 PM, Martin v. Löwis rep...@bugs.python.orgwrote:
Martin v. Löwis mar...@v.loewis.de added the comment:
What happens if, instead of putting strings in a dictionary directly, I
have them wrapped in something
Alex Gaynor alex.gay...@gmail.com added the comment:
I'm sorry then, but I'm a little confused. I think we pretty clearly
established earlier that requiring users to make changes anywhere they
stored user data would be dangerous, because these locations are often in
libraries or other places
Alex Gaynor alex.gay...@gmail.com added the comment:
So, to my reading of teh compatibility PEP this cannot be added wholesale,
unless there is a pure Python version as well. However, if it replaced re
(read: patched) it would be valid.
On Sun, Jan 29, 2012 at 1:26 AM, Nick Coghlan rep
Alex Gaynor added the comment:
For what it's worth, I'm not as concerned with the process of the PEP, as
having a single document we can review and discuss.
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Alex Gaynor added the comment:
A lot of builtins :)
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New submission from Alex Gaynor:
Following the length_hint PEP, we should expose this facility to end-python
programmers. The semantics would be basically: the list has behavior identical
to if you hadn't provided length_hint, except the VM is free to preallocate
efficiently.
CPython
Alex Gaynor added the comment:
python-dev/ideas may be a better place to have this discussion, but basically
if you're going to insist that stuff like this doesn't go into Python because
it isn't C++, people are going to have to write C++, and that makes me
incredibly sad.
There's an obvious
Alex Gaynor added the comment:
That strategy only works if you know the exact count, it fails if you only have
an estimate (as __length_hint__ gives you).
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New submission from Alex Gaynor:
str.split returns a list, which is inefficient when you just want to process
items one be one. You could emulate this with str.find and tracking indexes
manually, but this should really be a builtin behavior.
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priority
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Alex Gaynor added the comment:
The patch has been merged into libffi upstream:
https://github.com/atgreen/libffi/pull/32
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New submission from Alex Gaynor:
If I run:
$ python -mtest.test_tk
I get a skip, after speaking with people familiar with OS X, it appears that
the condition for the skip uses old Carbon APIs, which are totally deprecated
under 64-bit. Attached is a patch which should work.
--
files
Alex Gaynor added the comment:
This is a result of your shell automatically expeanding that, depending on what
shell you use there'll be a way to escape the *.
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New submission from Alex Gaynor alex.gay...@gmail.com:
All storing immutable objects in the memo dict does is slow stuff down, due to
having a larger hash table, and on some other Python's causing hilarious levels
of GC pressure. Using http://paste.pocoo.org/show/421310/ as a benchmark
Alex Gaynor alex.gay...@gmail.com added the comment:
A slightly cleverer version (or less clever, depending on how you approach the
issue) that also works with tuples of immutable content.
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Added file: http://bugs.python.org/file22499/d.diff
Alex Gaynor alex.gay...@gmail.com added the comment:
Switched to using assertIs, as merwok suggested.
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Alex Gaynor alex.gay...@gmail.com added the comment:
Amaury points out: this is not strictly about immutable objects, but rather
objects who's deepcopy is themselves (identity-wise), in some (rare I think)
cases this could provide a slowdown. Specifically a case of [(1, 2, 3)] *
1 would
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New submission from Alex Gaynor alex.gay...@gmail.com:
From python-ideas:
introduce array.zeroes, a new classmethod that provides an alternative
constructor, its signature is zeroes(typecode, length), which allows for
preallocating an array, with a lower overhead than methods such as
array
Alex Gaynor alex.gay...@gmail.com added the comment:
1) Yes, it address a real concern that arose during Armin's GSOC project which
has been developing a unified template compilation architecture (via the AST
module) for Django and Jinja2.
2) Asking speed questions about this is silly IMO
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Alex Gaynor alex.gay...@gmail.com added the comment:
This is caused by a cache which is kept of array's for different (Structure,
length) pairs.
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Alex Gaynor alex.gay...@gmail.com added the comment:
Personally, I regard every C function which, for obscure internal details,
doesn't take keyword arguments as a sad bug, which should of course be fixed :)
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Alex Gaynor alex.gay...@gmail.com added the comment:
I'm perfectly happy to write a patch for this, the only reason I didn't was
Martin and others expressed opposition to committing it. If there's a
philosophicaly opposition to the patch I won't write
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Alex Gaynor alex.gay...@gmail.com added the comment:
I think what you're looking for already exists:
http://docs.python.org/dev/library/stdtypes.html#int.bit_length
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Alex Gaynor added the comment:
Actually, I would argue that it's concatentation of a local variable which has
unexpected performance. Logically it should be O(n**2), however due to hacks in
CPython it isn't.
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Alex Gaynor alex.gay...@gmail.com added the comment:
On Mon, Feb 6, 2012 at 4:41 PM, Marc-Andre Lemburg
rep...@bugs.python.orgwrote:
Marc-Andre Lemburg m...@egenix.com added the comment:
Gregory P. Smith wrote:
Gregory P. Smith g...@krypto.org added the comment:
The release
Alex Gaynor alex.gay...@gmail.com added the comment:
On Mon, Feb 6, 2012 at 5:04 PM, Marc-Andre Lemburg
rep...@bugs.python.orgwrote:
Marc-Andre Lemburg m...@egenix.com added the comment:
Alex Gaynor wrote:
Can't randomization just be applied to integers as well?
A simple seed xor'ed
New submission from Alex Gaynor alex.gay...@gmail.com:
http://paste.pocoo.org/show/550884/ will reliably segfault Python3 on all
platforms (similar versions for Python2 using itertools work)
--
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messages: 153344
nosy: alex, benjamin.peterson
priority: normal
New submission from Alex Gaynor alex.gay...@gmail.com:
This is inconsistant with regular functions, which unfortunately prevents them
from being used interchangeably.
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priority: normal
severity: normal
status: open
title: Cannot set attributes
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New submission from Alex Gaynor alex.gay...@gmail.com:
This adds a new opcode which for certain list comprehensions (ones with no if
statements and only a single comprehension), preallocates the list to the
appropriate size.
Patch is against 2.7, because it was a bit easier. On:
def f
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Alex Gaynor alex.gay...@gmail.com added the comment:
FWIW pypy has an __buffer__ method (used exclusively internally, AFAIK), which
has semantics similar to your first proposal.
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Alex Gaynor alex.gay...@gmail.com added the comment:
This shouldn't be a problem for PyPy, in fact I'm almost positive that we
implement this already (since Django has a test that uses this feature).
If/when the spec is changed please make sure there are tests for all these
cases so we *know
New submission from Alex Gaynor:
Right now it calls islink(), which does an lstat, and then does its own lstat
on the same path. This can be optimized by inlining the body of islink and
reusing the stat result.
(This has been identified as an actual issue in openstack-swift
https
Alex Gaynor added the comment:
Attached is a simple first pass at a diff against 2.7, shoudl be easy to port
it to default.
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Added file: http://bugs.python.org/file31010/ismount.diff
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Alex Gaynor added the comment:
Addresses the review comments: returns to catching all oserrors
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Alex Gaynor added the comment:
Attached patch is against default. I don't have my ssh keys set up for this
machine, so if someone else could land I'd be appreciative :)
(Not sure if this qualifies for a backport)
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Added file: http://bugs.python.org/file31012/ismount-3k.diff
Alex Gaynor added the comment:
I'll confirm that PyPy raises a KeyError on the format() code.
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Alex Gaynor added the comment:
does this show demonstrable results (in either direction) on stringbench or the
benchmarks repo?
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Alex Gaynor added the comment:
The statistic that htis is *never* hit across a large python program is great
evidence that this isn't useful. +1 on removing from me.
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Alex Gaynor added the comment:
I suppose I'm one of the more qualified people to comment on how Ruby does it:
a mess of hacks in the lexer/parser. Ruby's case is complicated by the fact
that a bare `foo` can either be a local variable or a method call on self.
Consider the case `a +b`, should
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