Re: [Python-Dev] remaining issues from Klocwork static analysis

2006-07-26 Thread Gerhard Häring
Martin v. Löwis wrote:
> Neal Norwitz wrote:
>> # 61 Modules/_sqlite/cursor.c:599  Null pointer may be dereferenced
>>
>> Null pointer 'self->statement' that comes from line 674 may be
>> dereferenced by passing argument 1 to function
>> 'statement_mark_dirty' at line 599.
> 
> Looks like a problem. Maybe a break is missing after line 674?

The code is a bit complicated here, and admittedly not the nicest one, 
but I verified it and there is no problem here.

_query_execute() is designed to handle both executemany() and execute().

multiple is a local variable that is 1 if there is a set of tuples of 
SQL parameters (executemany) instead of a single tuple of SQL parameters 
(execute), in which case it's 0.

Before the while loop, the code makes sure that parameters_iter is an 
iterator that returns SQL parameter tuples. So if there is only a single 
parameter tuple, a temporary list is created an parameters_iter is an 
iterator over it.

So, if !multiple (referenced code in line 674), the while-loop will only 
be executed once, and in the second loop, the while-loop will exit 
because then the following code will break:

 parameters = PyIter_Next(parameters_iter);
 if (!parameters) {
 break;
 }

Code in line 599 is thus not executed with self->statement = 0.

-- Gerhard
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[Python-Dev] Need help with C - problem in sqlite3 module

2006-09-23 Thread Gerhard Häring
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Looks like I don't know C so well after all ...

Apparently at least gcc on Linux exports all symbols by default that are
not static. This creates problems with Python extensions that export
symbols that are also used in other contexts. For example some people use
Python and the sqlite3 module under Apache, and the sqlite3 module exports
a symbol cache_init, but cache_init is also used by Apache's mod_cache
module. Thus there are crashes when using the sqlite3 module that only
occur in the mod_python context.

Can somebody with more knowledge about C tell me how to fix the sqlite3
module or compiler settings for distutils so that this does not happen?

Of course this only happens because the sqlite3 module is distributed among
multiple .c files and thus I couldn't make everything "static".

Thanks in advance.

- -- Gerhard
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[Python-Dev] Python 3000: confused about str8, str, bytes

2007-08-13 Thread Gerhard Häring
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I maintain the sqlite module in the standard library, which makes heavy use
of PyString_* C API. Now I've made it work under Python 3000 insofar as
tests pass, but the new Python string semantics mean I have more work to do
here and make some API choices.

I've read in another thread that the future of str8 is not decided yet. To
be honest I was confused when I saw it first, it's documented nowhere as
far as I can see.

Is that decided yet? Is str8 going away?

What will happen with the Python C API? Will PyString_* become what
PyUnicode_* is in Python 2.x?

- -- Gerhard
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Re: [Python-Dev] Missing _sqlite checkin on trunk?

2007-12-10 Thread Gerhard Häring
[EMAIL PROTECTED] wrote:
> On Nov 25 Gerhard Haering checked in a change to the release25-maint branch:
> 
> Author: gerhard.haering
> Date: Sun Nov 25 18:40:35 2007
> New Revision: 59184
> 
> Modified:
>python/branches/release25-maint/Modules/_sqlite/statement.c
>python/branches/release25-maint/Modules/_sqlite/util.c
> Log:
> - Backported a workaround for a bug in SQLite 3.2.x/3.3.x versions where a
>   statement recompilation with no bound parameters lead to a segfault
> - Backported a fix necessary because of an SQLite API change in version 
> 3.5.
>   This prevents segfaults when executing empty queries, like our test 
> suite
>   does.
> 
> This bug is also present on the trunk, yet I saw no indication that he
> checked in such a fix there.  Gerhard's patch applies cleanly.  I sent him
> an email after I saw the checkin and verified that the patch worked on the
> trunk, but have yet to hear back from him.

Yes, I remember. I postponed updating the trunk because I planned sync 
it with the lastest pysqlite release instead. I've updated my TODO list.

> Is there some different method for getting sqlite changes into the trunk?

?! From my point of view it's a module like all the others, except it's 
also maintained externally as 'pysqlite'.

-- Gerhard
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Re: [Python-Dev] RELEASED Python 2.6a2 and 3.0a4

2008-04-04 Thread Gerhard Häring
Hello Barry,

Great job with the releases!

Barry Warsaw wrote:
> On behalf of the Python development team and the Python community, I'm  
> happy to announce the second alpha release of Python 2.6, and the  
> fourth alpha release of Python 3.0. [...]

In case you don't know already, the website is not fully updated, yet:

http://www.python.org/download/releases/2.6/

Top of the page says "2.6a1" instead of "2.6a2".

This file is apparently not yet updated for 2.6alpha2.

http://www.python.org/download/releases/2.6/NEWS.txt


For the 3.0 version:

Top of the page still says "3.0a3".

Cheers,

-- Gerhard
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[Python-Dev] Python 3.0: can we make dbm's .keys() return an iterator?

2008-09-11 Thread Gerhard Häring
As far as I can see, the specification of the dbm interface is the 
module docstring in dbm/__init__.py, which reads:


"""
[...]
It has the following interface (key and data are strings):

d[key] = data   # store data at key (may override data at
# existing key)
data = d[key]   # retrieve data at key (raise KeyError if no
# such key)
del d[key]  # delete data stored at key (raises KeyError
# if no such key)
flag = key in d # true if the key exists
list = d.keys() # return a list of all existing keys (slow!)
"""

Now I thought that in Python 3.0, keys(), values() and friends should 
return iterators. Can we change at least the specification of the dbm 
module? We could then later in 3.1 change the implementations to return 
iterators instead of lists, too.


I stumbled upon it cos I'm trying to help Skip with the SQLite-based 
implementation.


-- Gerhard
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Re: [Python-Dev] Determine minimum required version for a script

2008-10-01 Thread Gerhard Häring

techtonik wrote:

Can somebody remind how to check script compatibility with old Python versions?

I can remember PHP_CompatInfo class for PHP that parses a script or directory to
find out the minimum version and extensions required for them to run,
and I wonder
if there was anything like this for Python?


You posted on the *python-dev* mailing list.

On this list the key *Python developers* discuss the future of the 
language and its implementation. Topics include Python design issues, 
release mechanics, and maintenance of existing releases.


Please, do not post general Python questions to this list! For help with 
Python please use the mailing list [EMAIL PROTECTED] or the 
newsgroup comp.lang.python. Messages are routed between the two. so 
they're basically the same thing.


-- Gerhard
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Re: [Python-Dev] Using Cython for standard library?

2008-11-03 Thread Gerhard Häring

Calvin Spealman wrote:

On Mon, Nov 3, 2008 at 6:29 AM, Gerhard Häring <[EMAIL PROTECTED]> wrote:

Stefan Behnel wrote:

Michael Foord wrote:

Moving more C extensions to an implementation based on ctypes would be
enormously useful for PyPy, IronPython and Jython, but ctypes is not yet
as portable as Python itself which could be an issue (although one worth
resolving).

In the same line, moving more extensions to a high-level language like
Cython,
instead of writing them in straight C, would make a later switch to a
different environment a lot easier, as the extensions could be regenerated
with a modified Cython compiler (obviously minus some fixing of premature
optimisations and the like).

Is using Cython for anything in Modules/ really an option? In my limited
experiments with it, I did like it.

But using it for Python standard library stuff doesn't look quite right to
me:

- Option 1: distribute Cython with Python and integrate into build process
-- Ouch!


Can you be a bit more descriptive?


Cython is still being worked on (intensively, it seems). Bundling it 
with Python means deciding on a particular version probably for an 
entire major release lifecycle (use Cython x.y.{newest} for Python 2.7, 
for example).



- Option 2: only distribute generated source files
-- developers still need to have Cython installed
-- you have to trust Cython; who will really review the generated code?


Who reviews the machine code from gcc?


That's comparing apples and eggs :-P But it may be that I'm a little 
paranoid here.



I would love to see the option to write the lower levels in something
other than C, 


Absolutely. That's why I tried to reimplement pysqlite in something 
easier to maintain than handwritten Python C API. There's a ctypes-based 
version in its Mercurial repository that's good enough to be used from 
PyPy now. And a started Cython-based one.



but obviously any choice would have to be a good one.
[...]  So, the question I see isn't if Cython should be
allowed for standard library modules, but if the landscape of such
solutions is at a point that any of them is ready to be committed to.


ACK.

-- Gerhard
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[Python-Dev] Using Cython for standard library?

2008-11-03 Thread Gerhard Häring

Stefan Behnel wrote:

Michael Foord wrote:

Moving more C extensions to an implementation based on ctypes would be
enormously useful for PyPy, IronPython and Jython, but ctypes is not yet
as portable as Python itself which could be an issue (although one worth
resolving).


In the same line, moving more extensions to a high-level language like Cython,
instead of writing them in straight C, would make a later switch to a
different environment a lot easier, as the extensions could be regenerated
with a modified Cython compiler (obviously minus some fixing of premature
optimisations and the like).


Is using Cython for anything in Modules/ really an option? In my limited 
experiments with it, I did like it.


But using it for Python standard library stuff doesn't look quite right 
to me:


- Option 1: distribute Cython with Python and integrate into build process
-- Ouch!

- Option 2: only distribute generated source files
-- developers still need to have Cython installed
-- you have to trust Cython; who will really review the generated code?

-- Gerhard
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Re: [Python-Dev] http://www.python.org/dev/doc/devel still available

2006-02-16 Thread Gerhard Häring
Jeremy Hylton wrote:
> I don't think this message is on-topic for python-dev.  There are lots
> of great places to discuss the design of the python web site, but the
> list for developers doesn't seem like a good place for it.  Do we need
> a different list for people to gripe^H^H^H^H^H discuss the web site? [...]

Such as http://mail.python.org/mailman/listinfo/pydotorg-redesign ?

-- Gerhard
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Re: [Python-Dev] pysqlite for 2.5?

2006-03-28 Thread Gerhard Häring
Georg Brandl wrote:
> Anthony Baxter wrote:
> 
>>This came up before (back in October 2004!) but didn't go anywhere 
>>since, AFAICR. Do we want to consider including pysqlite in Python 
>>2.5? It's the only DB adaptor that I'd really consider suitable for 
>>shipping with the distribution, because it's self-contained.
>>
>>What's people's thoughts?
> 
> OTOH, +1 for a simple DB wrapper that makes it easy to start with DB-enabled
> applications. The trouble with it can't be worse than the BSDDB issues ;)
> 
> OTOH, pysqlite2 seems to have had a fairly rapid sequence of releases in the
> past. 

That's because I decided for a more rapid release cycle than I used in 
the past. If bugs are fixed and no features planned to implement in the 
near future, I made a release.

> I don't know whether it is now bug-free (the website claims that the
> 2.1 branch should be stable, and the 2.0 branch has proven stable).

There have been no more bug reports since 2.1, so I'm confident that all 
the glitches the switch to transparent compiled statements in 2.1 
introduced are fixed now.

> There also have been some API changes in the 2.0.x line, like the introduction
> of executemany() which broke e.g. SQLObject.

I missed that, can you provide a link please? pysqlite 2 was announced 
to be incompatible with pysqlite 1. I don't think there were any 
backwards incompatible API changes in the 2.x line.

> Anyway, almost all popular web frameworks rely on PySQLite and seem to work
> well with it.
> 
> Of course, speaking with Gerhard will be the way to find out more.

I'll try to throw in a bit more information that will be necessary for 
this discussion:

pysqlite 2.x is (almost) feature complete now. I've a few more changes 
sitting in SVN trunk that are waiting for the pysqlite 2.2 release. 
These are all about wrapping more of the SQLite API, like custom collations.

I *am* willing to be a maintainer of an SQLite module for Python. I will 
gladly help writing a PEP for it. But I won't be the champion for the 
idea, because I'm only +0 on adding external libraries to Python, like 
elementtree, or ctypes, or pysqlite instead of relying on 
setuptools/Cheese Shop.

I could probably be convinced that a fat Python is still a good idea 
nowadays, though :-)

-- Gerhard
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Re: [Python-Dev] pysqlite for 2.5?

2006-03-28 Thread Gerhard Häring
Georg Brandl wrote:
> Gerhard Häring wrote:
>>I'll try to throw in a bit more information that will be necessary for 
>>this discussion:
>>
>>pysqlite 2.x is (almost) feature complete now. I've a few more changes 
>>sitting in SVN trunk that are waiting for the pysqlite 2.2 release. 
>>These are all about wrapping more of the SQLite API, like custom collations.
> 
> In what timeframe will those be completed?

I would have waited for a pysqlite 2.2 release until I found a good API 
for logging for pysqlite (mainly for reporting exceptions in Python 
callbacks). I will probably defer the logging stuff to pysqlite 2.3 and 
release pysqlite 2.2 soon with the features currently in SVN.

I know that pushing new things into Python 2.5 should happen soon, if at 
all. So *if* pysqlite should go into Python, I propose that I release 
pysqlite 2.2.0 and we integrate that into the Python alpha release.

If this is going to happen, I want it to happen under a different 
package name than "pysqlite2" and it's probably a good idea to skip 
"sqlite" too, because there are still users of the SQLite 1.x API (*) 
and this is the package name of that API. OTOH, "sqlite" would be the 
natural name if it ends up in Python. Perhaps "sqlitedb" ...

Extensive unit tests are available, as is a reference manual in ReST format.

-- Gerhard

(*) Although if they're really using pysqlite 0.x/1.x then it's unlikely 
they'll switch to Python 2.5 with their applications.
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Re: [Python-Dev] pysqlite for 2.5?

2006-03-28 Thread Gerhard Häring
Martin v. Löwis wrote:
> Anthony Baxter wrote:
> 
>>This came up before (back in October 2004!) but didn't go anywhere 
>>since, AFAICR. Do we want to consider including pysqlite in Python 
>>2.5? It's the only DB adaptor that I'd really consider suitable for 
>>shipping with the distribution, because it's self-contained.
>>
>>What's people's thoughts?
> 
> We shouldn't include anything without the explicit permission of the
> author(s); 

I'm the only author of the pysqlite 2 codebase, so no problem here.

> if possible, the authors should grant the PSF permission
> to change the license (i.e. fill out the contributor agreement).

That would be no problem either.

> Even better, the authors should be willing to keep the version in
> Python synchronized with the separate release.

In particular, I would then synchronize changes that have proven stable 
in the standalone release to the Python core sqlite module. I think this 
is how Barry does it with the email module, too.

-- Gerhard
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Re: [Python-Dev] pysqlite for 2.5?

2006-03-29 Thread Gerhard Häring
Neal Norwitz wrote:
> On 3/28/06, Gerhard Häring <[EMAIL PROTECTED]> wrote:
> 
>>>Even better, the authors should be willing to keep the version in
>>>Python synchronized with the separate release.
>>
>>In particular, I would then synchronize changes that have proven stable
>>in the standalone release to the Python core sqlite module. I think this
>>is how Barry does it with the email module, too.
> 
> Everything Gerhard has said sounds good.  From what I read it seems
> that it might be good to add pysqlite to the stdlib eventually. 
> Overall, I'm +0 on the idea.  It seems everyone is pretty positive on
> the concept.
> 
> However, I'm -0 on adding this to 2.5.  We've already got a lot of
> changes.  I don't want us to keep piling more on.  Also I thought I
> saw Gerhard say that there were some other things he wanted to finish
> and the timing might work better for him to defer a bit.

My current and future plans for pysqlite are really only additional 
features, like wrapping the rest of the SQLite API.

> Some of these things sounded like API changes which may be more problematic
> once in the core as we may have stricter rules on backwards
> compatibility.

All my plans for pysqlite are adding more methods to the API, so I see 
no backwards compatibility problems.

> We also have to convert the doc from ReST to latex.  None of these are
> show stoppers, but it adds to the amount of work we need to do before
> release.  And there's already more work than we can handle.

I understand your concern for keeping the amount of work for a 2.5 
release manageable. So as Anthony Baxter said he'd like to work with me 
to make this happen, then I think he and I can try to not overload other 
people with more work.

Creating latex docs sounds like I could do it, too. What I'd personally 
like to offload are these two tasks:

- integreting pysqlite into the Python build process
- in particular the win32 build process

I would have access to Linux and win32 development machines with MS 
VS2003, but I don't have enough experience with the Python build process 
to not make stupid mistakes here.

-- Gerhard
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Re: [Python-Dev] pysqlite for 2.5?

2006-03-29 Thread Gerhard Häring
Barry Warsaw wrote:
> On Wed, 2006-03-29 at 19:47 +1100, Anthony Baxter wrote:
> 
>>My only concern about this is that it wouldn't be possible for other 
>>authors to provide 3rd party packages as (for instance) db.mysqldb
>>because of the way package importing works. And I'd prefer 
>>'database.sqlite' rather than 'db.sqlite'.
> 
> +1 on 'database' as the top-level package name.

I think short names are more more consistent with the existing naming in 
the standard library.

+1 on db.sqlite from me.

db.sql.sqlite is another possibility, if adding something like Durus or 
ZODB in the same top-level namespace could be considered for 2.6.

-- Gerhard
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Re: [Python-Dev] pysqlite for 2.5?

2006-03-29 Thread Gerhard Häring
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Phillip J. Eby wrote:
> At 11:36 AM 3/29/2006 -0800, Guido van Rossum wrote:
>> [...] Perhaps one person in favor and one
>> person against could summarize the argument for me?
> 
> Pro:
> 
> * SQLite is really nice to have for writing simple applications with small 
> data needs, especially client-side software.  It's probably the 
> best-of-breed open source embedded SQL DB right now.
> * So, having a wrapper would be a big "Batteries included" plus for Python

That would be my arguments, too.

> Con:
> 
> * Competing Python wrappers exist

There is really only one other relevant wrapper: APSW. It was
purposefully designed to *not* use the DB-API 2.0 (though a similar
one), and being a "thinner" wrapper of SQLite.

It wraps a few more functions of the SQLite API, though less and less,
because pysqlite is catching up here.

While there might be arguments for a "thinner" wrapper, I think that
pysqlite has the advantage of being DB-API compliant (even with most
optional DB-API extensions) and thus offers a good way to prototype
database apps with a smooth upgrade path to other, more powerful, databases.

> * SQLite itself is updated frequently, let alone the wrappers

SQLite being updated regularly is not really a problem, because we can
link dynamically against SQLite. And we probably *should* do this on
Windows, too, so users can replace a SQLite.DLL with an updated version
if they wish to.

> * Build integration risks unknown, possible delay of 2.5?
> * Another external library to track and maybe have emergency updates of

Emergency updates are only for security problems, right? I don't think
this would apply to pysqlite. I don't think that would apply to SQLite
either, but if it's conceivable, it's another argument for dynamic linking.

- -- Gerhard
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Re: [Python-Dev] Discussing the Great Library Reorganization

2006-03-29 Thread Gerhard Häring
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Brett Cannon wrote:
> While this is going to require a PEP (which I am willing to write),
> the discussion of adding pysqlite has brought forth some discussion on
> naming and packaging in the stdlub.  Perhaps it's time to start
> discussing the Great Library Reorganization that has been discussed
> for eons. [...]

Wouldn't the newly founded python-3000 mailing list be the perfect place
for such major changes?

- -- Gerhard
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Re: [Python-Dev] pysqlite for 2.5?

2006-03-30 Thread Gerhard Häring
M.-A. Lemburg wrote:
> [...]
> Also your statement regarding sqlite3 suggests that sqlite
> itself is not included - why not ?

- SQLite sources are 1.57 MiB uncompressed, we wouldn't want to add that 
to the Python sources download size, would we?
- I personally would not want to have the job to "bless" a certain 
version of SQLite for being bugfree enough to be used until the next 
Python minor release. And we wouldn't want to push a Python minor 
release just somebody found an obscure data corroption bug in a SQLite 
release
- SQLite might not compile on some less common platforms (AIX, HP/UX, 
Win64, whatever) that Python compiles fine on.
- I believe Python is written in more portable C than SQLite. So it 
might be certain compilers that fail for compiling SQLite.
- At some point you might also want a sqlite commandline shell instead 
of just the shared library, too.

All of these are non-issues if we just compile against an installed 
SQLite on Unix-like system if it can be found.

On Windows, I also prefer to have a dynamically linked SQLite Python 
module. We can distribute the SQLITE3.DLL with Python, and then people 
could just download an updated SQLITE.DLL from http://sqlite.org/ and 
overwrite the existing one of the Python installation, *if* an important 
bug is fixed in SQLite.

> Isn't the main argument for having pysqlite included in the
> core to be able to play around with SQL without relying
> on external libraries ?

This, and that you can prototype without having to install and configure 
a database server. For many applications, the prototype can be the final 
version.

-- Gerhard
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Re: [Python-Dev] pysqlite for 2.5?

2006-03-30 Thread Gerhard Häring
Fredrik Lundh wrote:
> Anthony Baxter wrote:
> 
> 
>>>Such a module name is less likely to cause problems.
>>
>>Excellent point. Hm. Maybe we should just go with 'sqlite', instead.
> 
> 
> except that "sqlite" was the name used by the first pysqlite
> generation:
> 
> $ python2.3
> 
import sqlite
sqlite.version
> 
> '1.1.6'
> 
> I'm not sure how much trouble reusing this name would cause, but I'm
> quite sure the amount of trouble is larger than "none at all".

"sqlitedb" is not taken yet.

-- Gerhard
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Re: [Python-Dev] pysqlite for 2.5?

2006-03-30 Thread Gerhard Häring
M.-A. Lemburg wrote:
> Will it also work with e.g. sqlite 2.8.15 (ie. sqlite < v3) -
> this is the standard version on SuSE 9.2.

No, SQLite 3 has a completely different API than SQLite 2.x. If you need 
a Python module for it, you can use pysqlite 1.0.1.

>>>Also your statement regarding sqlite3 suggests that sqlite
>>>itself is not included - why not ?
>>
>>For the same reasons we don't include the BerkeleyDB library. Many, 
>>many modern operating systems now ship with libsqlite3 (just as they 
>>ship with bsddb).  While sqlite is nowhere near the size of 
>>BerkeleyDB, it's still a non-trivial amount of code. 
> 
> 
> If it works with sqlite2 then I agree: these versions are
> usually available on Unixes. sqlite3 is not as wide-spread
> yet.
> 
> What about the Windows build ? Will that contain the necessary
> DLLs ?

I proposed to link dynamically on Windows, and ship the Windows 
SQLite3.DLL. This has two advantages:

- Python users can upgrade the SQLite3.DLL by a simple download from in 
case of emergency
- we could make it so that win32 Python core developers (or the Python 
win32 build process) don't have to build SQLite when building Python

-- Gerhard
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Re: [Python-Dev] pysqlite for 2.5?

2006-03-31 Thread Gerhard Häring
Martin v. Löwis wrote:
> Terry Reedy wrote:
> 
>>"Gerhard Häring" <[EMAIL PROTECTED]> wrote in message 
>>news:[EMAIL PROTECTED]
>>
>>>I proposed to link dynamically on Windows, and ship the Windows
>>>SQLite3.DLL. This has two advantages:
>>>
>>>- Python users can upgrade the SQLite3.DLL by a simple download from in
>>>case of emergency
>>
>>+1 and thanks from a Windows user
> 
> This binary depends on msvcrt.dll. Does anybody know whether this could
> cause a problem? IOW, is any of the forbidden API used across the DLL
> boundary (in particular: memory management, stdio, locales)?

AFAIK SQLite does not use stdio or locales. Memory management is 
normally never done explicitly, but by API calls using opaque pointers 
to the SQLite structure, for example:

- sqlite3_compile will return a SQLite statement.
- sqlite3_finalize will clean up the SQLite statement, and return any 
memory used by it.

The only explicit memory management function I know is

void sqlite3_free(char *z);

which looks ok, too. And pysqlite doesn't use it, anyway.

-- Gerhard
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[Python-Dev] PSF Contributor Agreement for pysqlite

2006-04-10 Thread Gerhard Häring
Posting here because I don't know a better place:

Federico di Gregorio and me have both faxed PSF contributor agreements 
to the PSF for integration of pysqlite into Python 2.5.

-- Gerhard
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Re: [Python-Dev] Raising objections

2006-04-19 Thread Gerhard Häring
Neal Norwitz wrote:
> What are the doc plans for these modules:
> +  * ctypes
> +  * ElementTree/cElementTree
> +  * msilib
> +  * pysqlite

pysqlite: I've started on new module docs for the "sqlite3" module in 
the Python standard library, based on the text from the existing 
pysqlite reference manual. Progress is about 5 % perhaps, I spent the 
most time figuring out how the Python doc build process works.

We should probably check my docs in soon even in a preliminary state, so 
  they can be reviewed/improved.

Speaking of which, what about SVN commit privileges for me?

It's not a big problem to tunnel my stuff through Anthony or others, but 
   I think this would save resources.

-- Gerhard
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Re: [Python-Dev] draft of externally maintained packages PEP

2006-04-26 Thread Gerhard Häring
Brett Cannon wrote:
> here is the rough draft of the PEP for packages maintained externally
> from Python itself.  There is some missing, though, that I would like
> help filling in.
> 
> I don't know who to list as the contact person (i.e., the Python
> developer in charge of the code) for Expat, Optik or pysqlite. [...]
> I also thought Gerhard Haering was in charge of pysqlite, but he has 
> never responded to any emails about this topic. 

Sorry for not answering any sooner. Please list me as contact person for 
the SQLite module.

> Maybe the responsibility should go to Anthony since I know he worked
> to get the package in and probably cares about keeping it updated?
> As for Expat (the parser), is that Fred? [...]
> 
> 
> pysqlite
> 
> - Web site
> http://www.sqlite.org/
> - Standard library name
> sqlite3
> - Contact person
> XXX
> - Synchronisation history
> * 2.1.3 (2.5)

You can add

* 2.2.0
* 2.2.2

here.

-- Gerhard
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Re: [Python-Dev] need info for externally maintained modules PEP

2006-04-26 Thread Gerhard Häring
Brett Cannon wrote:
> OK, I am going to write the PEP I proposed a week or so ago, listing
> all modules and packages within the stdlib that are maintained
> externally so we have a central place to go for contact info or where
> to report bugs on issues.  This should only apply to modules that want
> bugs reported outside of the Python tracker and have a separate dev
> track.  People who just use the Python repository as their mainline
> version can just be left out. [...]

I prefer to have bugs on the sqlite module reported in the pysqlite 
tracker at http://pysqlite.org/ aka http://initd.org/tracker/pysqlite

For bug fixes I have the same position as Fredrik: security fixes, bugs 
that block the build and warnings from automatic checkers should be done 
through the Python repository and I will port them to the external version.

For any changes that reach "deeper" I'd like to have them handed over to me.

As it's unrealistic that all bugs are reported through the pysqlite 
tracker, can it please be arranged that if somebody enters a SQLite 
related bug through the Sourceforge tracker, that I get notified? 
Perhaps by defining a category SQLite here and adding me as default 
responsible, if that's possible on SF.

Currently I'm not subscribed to python-checkins and didn't see a need 
to. Is there a need to for Python core developers? I think there's no 
better way except subscribing and defining a filter for SQLite-related 
commits to be notified if other people commit changes to the SQLite 
module in Python?

It's not that I'm too lazy, but I'd like to keep the number of things I 
need to monitor low.

-- Gerhard
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[Python-Dev] rest2latex - was: Re: Raising objections

2006-04-28 Thread Gerhard Häring
Thomas Heller wrote:
> [...] I'm now happy with the tool that converts the ctypes tutorial from reST 
> to LaTeX,
> I will later (today or tomorrow) commit that into Python SVN.

Did you commit that already? Alternatively, can you send it to me, please?

-- Gerhard
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[Python-Dev] Status: sqlite3 module docs

2006-05-12 Thread Gerhard Häring
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

Hello,

I've now moved over all the content from the pysqlite reference manual to
the sqlite3 module docs.

It would be nice if now somebody with more experience with Python
documentation could look over it.

A few things I know could be changed:

- - Just like with the pysqlite docs, the reference manual tries to have many
examples. I've put these under Doc/lib/sqlite/*.py. All other modules have
the .py files directly in Doc/lib/ - I don't know if this is necessary for
some reason unknown to me. For building HTML docs, having them in a
subdirectory works fine.

- - Some (or some more) of the examples could probably be moved into a
directory in Demo/ instead.

- - There's no tutorial for the sqlite3 module right now, all is in
reference-manual style.

I'll continue to work on this if somebody tells me what to do, but for now
it would be nice if somebody could clean it up (and maybe also tell me why
certain clean-ups are done - I don't know how indentation is handled for
text and examples, e. g.).

- -- Gerhard
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Re: [Python-Dev] beta1 coming real soon

2006-06-09 Thread Gerhard Häring
Neal Norwitz wrote:
> It's June 9 in most parts of the world.  The schedule calls for beta 1
> on June 14.  That means there's less than 4 days until the expected
> code freeze.  Please don't rush to get everything in at the last
> minute.  The buildbots should remain green to keep Anthony happy and
> me sane (or is it the other way around). [...]

I would have liked to implement the last major missing piece from 
pysqlite - the authorizer hook - release pysqlite 2.3.0 and merge the 
changes into the Python core sqlite3 module.

This would be an additional feature and not require any changes to the 
existing code.

If you'd rather not have this merged because of new code, then I'll skip it.

There are other changes I did in pysqlite for pysqlite 2.3.0 that I'd 
more strongly like to integrate here:

http://initd.org/tracker/pysqlite/changeset/274

This changeset fixes a real bug that can lead to hard crashes and also 
makes the sqlite module more sane:

- converter names are looked up in a case-insensitive manner (the old 
behaviour is confusing to users)
- Errors in callbacks are not silently ignored any longer, but lead to 
the query being aborted
- Additionaly, the error can be echoed to stderr if a debugging flag is 
set (default is off)

-- Gerhard

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[Python-Dev] sqlite3 test errors - was : Re: [Python-checkins] r46936 - in python/trunk: Lib/sqlite3/test/regression.py Lib/sqlite3/test/types.py Lib/sqlite3/test/userfunctions.py Modules/_sqlite/conn

2006-06-14 Thread Gerhard Häring
Co-posting to python-dev in the hope of getting help of people verifying 
my suspicion ...

Gerhard Häring wrote:
> [...]
> For some reason, they don't seem to have picked up the changed tests of 
> the sqlite3 module. At least the error messages look exactly like the 
> ones I had when I ran the current code against old tests.

That guess was wrong. The failed sqlite3 tests come from an old SQLite 
version being linked against. Until recently, SQLite was buggy and it 
was only fixed in

http://www.sqlite.org/cvstrac/chngview?cn=2981

that callbacks can throw errors that are usefully returned to the 
original caller.

The tests for the sqlite3 module currently assume a recent version 
SQLite (3.3.something). Otherwise some tests will fail.

Still, it can be built against any SQLite 3 release.

Can somebody please also verify if the malloc/free error message goes 
away (it really only happened on Mac, didn't it?) if you upgrade SQLite 
to the latest version on the build host?

-- Gerhard
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Re: [Python-Dev] [Python-checkins] sqlite3 test errors - was : Re: r46936 - in python/trunk: Lib/sqlite3/test/regression.py Lib/sqlite3/test/types.py Lib/sqlite3/test/userfunctions.py Modules/_sqlite/

2006-06-14 Thread Gerhard Häring

Gerhard Häring wrote:
Co-posting to python-dev in the hope of getting help of people verifying 
my suspicion ...


Gerhard Häring wrote:

[...]
For some reason, they don't seem to have picked up the changed tests of 
the sqlite3 module. At least the error messages look exactly like the 
ones I had when I ran the current code against old tests.


That guess was wrong. The failed sqlite3 tests come from an old SQLite 
version being linked against. Until recently, SQLite was buggy and it 
was only fixed in


http://www.sqlite.org/cvstrac/chngview?cn=2981

that callbacks can throw errors that are usefully returned to the 
original caller.


The tests for the sqlite3 module currently assume a recent version 
SQLite (3.3.something). Otherwise some tests will fail.


Still, it can be built against any SQLite 3 release.

Can somebody please also verify if the malloc/free error message goes 
away (it really only happened on Mac, didn't it?) if you upgrade SQLite 
to the latest version on the build host?


With SQLite 3.2.8, I also get segfaults on Linux x86 (Ubuntu dapper, gcc).

I've provided a preliminary patch (cannot check in from this place) that 
I've attached. Maybe somebody wants to test it, otherwise I'll make a 
few other tests in the late evening and probably also selectively 
disable certain tests in the test suite if the SQLite version is too old 
to pass them.


-- Gerhard
Index: Modules/_sqlite/connection.c
===
--- Modules/_sqlite/connection.c(revision 46958)
+++ Modules/_sqlite/connection.c(working copy)
@@ -34,6 +34,16 @@
 
 static int connection_set_isolation_level(Connection* self, PyObject* 
isolation_level);
 
+
+void _sqlite3_result_error(sqlite3_context* ctx, const char* errmsg, int len)
+{
+#if SQLITE_VERSION_NUMBER >= 3003003
+sqlite3_result_error(ctx, errmsg, len);
+#else
+/* sqlite3_result_null(ctx); */
+#endif
+}
+
 int connection_init(Connection* self, PyObject* args, PyObject* kwargs)
 {
 static char *kwlist[] = {"database", "timeout", "detect_types", 
"isolation_level", "check_same_thread", "factory", "cached_statements", NULL, 
NULL};
@@ -526,7 +536,7 @@
 } else {
 PyErr_Clear();
 }
-sqlite3_result_error(context, "user-defined function raised 
exception", -1);
+_sqlite3_result_error(context, "user-defined function raised 
exception", -1);
 }
 
 PyGILState_Release(threadstate);
@@ -558,7 +568,7 @@
 } else {
 PyErr_Clear();
 }
-sqlite3_result_error(context, "user-defined aggregate's '__init__' 
method raised error", -1);
+_sqlite3_result_error(context, "user-defined aggregate's 
'__init__' method raised error", -1);
 goto error;
 }
 }
@@ -582,7 +592,7 @@
 } else {
 PyErr_Clear();
 }
-sqlite3_result_error(context, "user-defined aggregate's 'step' method 
raised error", -1);
+_sqlite3_result_error(context, "user-defined aggregate's 'step' method 
raised error", -1);
 }
 
 error:
@@ -619,7 +629,7 @@
 } else {
 PyErr_Clear();
 }
-sqlite3_result_error(context, "user-defined aggregate's 'finalize' 
method raised error", -1);
+_sqlite3_result_error(context, "user-defined aggregate's 'finalize' 
method raised error", -1);
 } else {
 _set_result(context, function_result);
 }
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Re: [Python-Dev] [Python-checkins] sqlite3 test errors - was : Re: r46936 - in python/trunk: Lib/sqlite3/test/regression.py Lib/sqlite3/test/types.py Lib/sqlite3/test/userfunctions.py Modules/_sqlite/

2006-06-14 Thread Gerhard Häring
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

Tim Peters wrote:
> [Gerhard Häring]
>>> ...
>>> Until recently, SQLite was buggy and it was only fixed in
>>>
>>> http://www.sqlite.org/cvstrac/chngview?cn=2981
>>>
>>> that callbacks can throw errors that are usefully returned to the
>>> original caller.
>>>
>>> The tests for the sqlite3 module currently assume a recent version
>>> SQLite (3.3.something). Otherwise some tests will fail.
> 
> Sounds like that explains why none of the Windows buildbots failed (on
> Windows, Python currently uses the sqlite checked in at
> 
> http://svn.python.org/projects/external/sqlite-source-3.3.4
> 
> ).  I suppose some OSes think they're doing you a favor by forcing you
> to be the system SQLite admin ;-)

Yes, this issue made development of the SQLite module a bit more
"interesting" for me. And I deserved no better for committing changes so
late before beta1.

Anyway, I verified my theory about the SQLite bugs (that's what they are),
and added version checks to the C code and to the test suite, so now
Everything Should Work (*crossing fingers*).

If anything should still fail, I'll ruthlessly blame Anthony, he brought
the idea up of supporting older SQLite versions in the first place :-P

- -- Gerhard
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Re: [Python-Dev] [Python-checkins] sqlite3 test errors - was : Re: r46936 - in python/trunk: Lib/sqlite3/test/regression.py Lib/sqlite3/test/types.py Lib/sqlite3/test/userfunctions.py Modules/_sqlite/

2006-06-14 Thread Gerhard Häring
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

Anthony Baxter wrote:
> Well, the just-released Ubuntu 06.06 LTS (Long Term Support) ships 
> with sqlite 3.2.8. I'd suggest that whatever version ships with 
> Python should _at_ _least_ work with this version. 

I have no problems continuing to support any halfway sane version, and that
is 3.0.8 or later (AFAIR the first non-beta SQLite 3.x release anyway). It
just requires a bit more testing.

> [...]
> Alternately, we ship the sqlite3 code with Python. I'm deeply 
> unthrilled with this idea, as it means more emergency security 
> releases to fix sqlite3 security bugs, as well as bloating out the 
> size of the release.

No, that's not an option.

> In the meantime, I'd suggest the appropriate fix is to roll back to 
> the previous version of the python-sqlite bindings on the trunk. 

Why? The previous version is really no better, except it ignores errors in
callbacks for all SQLite versions, instead of doing something useful and
aborting the query with a useful error message for those SQLite versions
that support it.

- -- Gerhard
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Re: [Python-Dev] Dropping externally maintained packages (Was: Please stop changing wsgiref on the trunk)

2006-06-19 Thread Gerhard Häring
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

Thomas Heller wrote:
> Martin v. Löwis wrote:
>> Guido van Rossum wrote:
 4 of the 6 modules in PEP 360 were added to Python in 2.5, so if you want
 to get rid of it, *now* would be the time.
>>> I'm all for it.
>>>
>>> While I am an enthusiastic supporter of several of those additions, I
>>> am *not* in favor of the special status granted to software
>>> contributed by certain developers, since it is a burden for all other
>>> developers.
>> Then I guess we should deal with before 2.5b1, and delay 2.5b1 until the
>> status of each of these has been clarified.
>>
>> Each maintainer should indicate whether he is happy with a "this is
>> part of Python" approach. If so, the entry should be removed from PEP
>> 360 (*); if not, the code should be removed from Python before beta 1.
> 
> I will be happy to say "ctypes is part of Python" (although I *fear* it
> is not one of the packages enthusiastically supported by Guido ;-).

The same goes for the sqlite3 module. I see it as part of Python and also
see it as my job synchronize bugfixes with the external version both ways.

I'll also add statements to the source files to ask developers to keep
Python 2.3 compatibility.

> [...]
> I am *very* thankful for the fixes, the code review, the suggestions,
> and the encouragement I got by various python-devers. [...]

Ditto :-)

So, somebody can please adjust the PEPs for the sqlite3 module accordingly.

- -- Gerhard
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[Python-Dev] Small sqlite3 test suite fix (Python 2.5b1 candidate)

2006-06-20 Thread Gerhard Häring
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

http://www.python.org/sf/1509584

Please apply if you think it should go in Python 2.5b1, otherwise I'll
commit it after the freeze.

I'd personally postpone it, because it's only cosmetic (but maybe it's
related to the strange sqlite3 regression test failure Neil reported).

Also, somebody please add me as Python developer on Sourceforge (I cannot
assign items to myself there).

- -- Gerhard
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Re: [Python-Dev] Small sqlite3 test suite fix (Python 2.5b1 candidate)

2006-06-20 Thread Gerhard Häring
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

Tim Peters wrote:
> [Gerhard Häring]
>> ...
>> Also, somebody please add me as Python developer on Sourceforge (I cannot
>> assign items to myself there).
> 
> If you still can't, scream at me ;-)

Bwah!!! :-P

I still cannot see myself in the "Assigned to" dropdown ...

- -- Gerhard
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Re: [Python-Dev] doc for new restricted execution design for Python

2006-06-22 Thread Gerhard Häring
Brett Cannon wrote:
> I have been working on a design doc for restricted execution of Python
> [...]

All the rest of the API made sense to me, but I couldn't understand why

PyXXX_MemoryFree

is needed. How could memory usage possibly fall below 0?

-- Gerhard
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Re: [Python-Dev] doc for new restricted execution design for Python

2006-06-22 Thread Gerhard Häring
Brett Cannon wrote:
> On 6/22/06, *Gerhard Häring* <[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>> 
> wrote:
> 
> Brett Cannon wrote:
>  > I have been working on a design doc for restricted execution of
> Python
>  > [...]
> 
> All the rest of the API made sense to me, but I couldn't understand why
> 
> PyXXX_MemoryFree
> 
> is needed. How could memory usage possibly fall below 0?
> 
> It can't in real life, but people could call MemoryFree() too many 
> times.  Plus you need some way to lower the amount when memory is 
> freed.  No need to penalize a script that does a bunch of malloc/free 
> calls compared to one that just does a bunch of malloc calls.

But if you want to limit the amount of memory a Python interpreter can 
use, wouldn't you have to integrate that resource checking into the 
standard Alloc/Dealloc functions instead of only enforcing the resource 
limit when some new API functions are called?

Existing extension modules and existing C code in the Python interpreter 
have no idea of any PyXXX_ calls, so I don't understand how new API 
functions help here.

-- Gerhard
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Re: [Python-Dev] a quit that actually quits

2005-12-27 Thread Gerhard Häring
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Ka-Ping Yee wrote:
> [...]
> (b) If more handholding seems like a good idea, then:
> 
> class ExitHatch:
> def __call__(self): sys.exit()
> def __repr__(self): return ''
> __builtins__.exit = __builtins__.quit = ExitHatch()

That looks like a good compromise to me.

- -- Gerhard
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