Re: Async client for PostgreSQL?
On Friday, August 31, 2012 10:17:18 PM UTC-7, Laszlo Nagy wrote: Is there any extension for Python that can do async I/O for PostgreSQL As others point out, the easiest route is using one of the blocking drivers with threads and emulate async operations. However, the low-level parts of py-postgresql (python.projects.postgresql.org) were designed with arbitrary modes in mind. That is, the protocol code is independent of the transport so that it could be used with frameworks like twisted given some effort. Much of the work that will go into py-postgresql over the next couple years will be to make it easier to integrate into arbitrary frameworks. Currently, I suspect it would require some heavy lifting.. =\ cheers, github.com/jwp -- http://mail.python.org/mailman/listinfo/python-list
Re: ANN: visage (interfaces)
On Sunday, July 29, 2012 10:18:23 PM UTC-7, jwp wrote:
What's c.l.py's perspective on managing interfaces and implementations?
I pushed another version with support for IID references, so you can refer to
implementations in annotations. The ultimate point of this is to give registry
queries the ability to check for implementations with particular features:
@visage.lib.implementation('foo')
class Imp(object):
def meth(self) - visage.lib.reference('bar'):
...
Imp.meth making a statement that a 'bar' implementation will be returned.
That is, consider code that is not aware of the modules that Imp is stored in
but wants a 'foo' implementation whose meth method returns a 'bar' instance.
Registry queries pave the way for supporting IID based implementation
resolution. There is also the potential that registry information could be
extracted on package installation for the purpose of an implementation index.
Implementations could be imported on demand by modules that have no knowledge
of the implementation.
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Re: On-topic: alternate Python implementations
On Friday, August 3, 2012 11:15:20 PM UTC-7, Steven D'Aprano wrote: WPython - another optimizing version of Python with wordcodes instead of bytecodes. http://code.google.com/p/wpython/ I remember reading about this a while ago. I thought this was eventually going to be committed to CPython... =\ -- http://mail.python.org/mailman/listinfo/python-list
Re: ANN: visage (interfaces)
On Monday, July 30, 2012 6:09:10 PM UTC-7, alex23 wrote: a side project, so I may have some more concrete feedback soon :) =) BTW I think if you rename the ReStructured Text docs to .rst github will automatically render them. Did not know that. Gonna go do a lot of git mv's now. Thanks. -- http://mail.python.org/mailman/listinfo/python-list
Re: ANN: visage (interfaces)
On Monday, July 30, 2012 7:09:03 PM UTC-7, Steven D'Aprano wrote: Do *one* and see if github actually does render it. Then do the rest. Did it for one project. It does render it. =) Naturally, sphinx autodoc links don't work. =( Come-on github, use dat fundin' -- http://mail.python.org/mailman/listinfo/python-list
ANN: visage (interfaces)
Hi, I just pushed this up to pypi/github, and I hoped to acquire some c.l.py opinions. It's experimental at this point, and might get scrapped. visage is a loosely coupled interface registry. weakrefs make it cake to implement. Basically, zope.interface, but where the interfaces are referenced by an identifier instead of the defining Interface class. Also, ABC registration is performed when the Interface becomes available so that isinstance/issubclass checks can be performed on Implementation instances/classes. FWICT, pyprotocols allows for something like this, but while introducing many interesting concepts. (; Currently, visage has no concept of adaption, but I'm suspecting that it could be built *on top* of the existing foundation. Personally, I'd prefer to reference interfaces by an identifier. Notably, the idea of having to pull in a dependency in order to perform local tests that have no need for the formal Interface class is reason enough for me to use something like this instead of the existing solutions. Sure, to each their own.? What's c.l.py's perspective on managing interfaces and implementations? Fuck it, ship it? =) -- http://mail.python.org/mailman/listinfo/python-list
Re: ANN: visage (interfaces)
On Sunday, July 29, 2012 10:18:23 PM UTC-7, jwp wrote: I just pushed this up to pypi/github, and I hoped to acquire some c.l.py opinions. http://github.com/jwp/py-visage -- http://mail.python.org/mailman/listinfo/python-list
Re: How to represent dates BC
On Tuesday, July 24, 2012 2:55:29 AM UTC-7, Laszlo Nagy wrote: conn.getqueryvalue(select '1311-03-14 BC'::date) What is the good representation here? Should I implement my own date Do your datetime formatting in postgres: select '1311-03-14 BC'::date::text PG does have a have a reasonable set of functions for working with datetime. If you need something more complicated than a simple cast to text, I'd suggest creating a function: CREATE OR REPLACE FUNCTION fmt_my_dates(date) RETURNS text LANGUAGE SQL AS $$ SELECT EXTRACT(.. FROM $1)::text || ... $$; -- http://mail.python.org/mailman/listinfo/python-list
Automatic setup of meta path hooks?
Hi, I'm working on a meta path hook that performs compilation of C extension modules on import ( github.com/jwp/py-c ; pip install c ). It mostly works, but I'm having a hard time finding a standard way to automatically install the hook upon interpreter startup. I've thought about just having depending projects install the loader themselves, but I was hoping to make it seamless...Not to mention, there's the possibility of the case where the extension module is compiled and installed with setup.py. In which case, the loader isn't necessary, so it seems inappropriate to reference and install the meta path hook in an outer package module. Am I missing something? Is there some setuptools/distribute magicalawesome that I can use? -- http://mail.python.org/mailman/listinfo/python-list
py-postgresql 1.0 released
I'm pleased to announce the release of py-postgresql version 1.0, the pure Python 3 driver for PostgreSQL formerly known as 'pg_proboscis'. Highlights: * CopyManager for connection-to-connection COPY operations. * NotificationManager for receiving asynchronous notifications with payloads. * Advisory Lock Context Manager. * hstore type support. * Improved performance. 2x, in some cases. For a more detailed list of changes, visit: http://python.projects.postgresql.org/docs/1.0/changes.html If you are interested in seeing this backported to Python 2.x, please let me know. Homepage: http://python.projects.postgresql.org SCM: http://github.com/jwp/py-postgresql Mailing List: http://pgfoundry.org/mailman/listinfo/python-general -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
py-postgresql 0.9 Released: Speed Query Libraries
I'm pleased to announce the release of py-postgresql 0.9.0 and 0.8.2. py-postgresql is a Python programmer's client (driver) for PostgreSQL and general toolkit for working with PostgreSQL in Python. http://python.projects.postgresql.org/?utm_source=releaseutm_medium=emailutm_campaign=py-postgresql-0.9.0 Changes in 0.9: * Performance Improvements. Always nice. =) * Query Libraries--statement management. * Display of line and relative location of the POSITION for syntax errors. * DB-API now extends PG-API. * Many under-the-hood improvements. Special thanks to the following bug reporters: Mike Bayer [Broken DB-API row counts] Dallas Morisett [Broken procedure reference generation] ... Bugs, while of crunchy consistency, are fearlessly squashed. ... If you find a bug, a report would be greatly appreciated. http://pgfoundry.org/tracker/?atid=442group_id=194 -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
py-postgresql-0.8.1 for Python 3 Released: Bugs
I'm pleased to announce the release of py-postgresql 0.8.1. This release marks major bug fixes for the 0.8 branch. http://python.projects.postgresql.org Fixes: * Memory leak due to __del__ and circular references. [Reported by Valentine Gogichashvili] * Encoding normalization issue. [Reported by Marc Silver] * Other minor issues. Documentation: http://python.projects.postgresql.org/0.8 Source: http://python.projects.postgresql.org/files/py-postgresql-0.8.1.tar.gz Win32 Installer: hhttp://python.projects.postgresql.org/files/py-postgresql-0.8.1.win32-py3.0.exe -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
py-postgresql-0.8 for Python 3 Released: Was pg_proboscis
I'm pleased to announce the release of py-postgresql 0.8. This release
marks months of work porting the 2.x code to Python 3 and making
numerous improvements. py-postgresql is a port of pg_proboscis-1.0 and
other projects under the pg/python project umbrella. This release
simplifies the project structure by combining the smaller projects
into one easy-to-manage package.
http://python.projects.postgresql.org
Documentation:
http://python.projects.postgresql.org/docs/0.8
Source:
http://python.projects.postgresql.org/files/py-postgresql-0.8.0.tar.gz
Win32 Installer:
http://python.projects.postgresql.org/files/py-postgresql-0.8.0.win32-py3.0.exe
Features:
* BSD/MIT/PSF Licensed.
* Documentation. =)
* Pure-Python + C optimizations. No need for libpq.
* Prepared Statement driven interface/native APIs. (DB-API 2.0 is here
too ;)
(PG-API, [Was: pg_greentrunk])
* Scrollable cursors with configurable direction for paging.
* COPY support. [iter(db.prepare(COPY table TO STDOUT))]
* Windows support. We love you too. ;)
* pg_python quick console.
$ pg_python -h localhost - Gives a Python prompt with a connection
bound to `db`.
* Support for most PostgreSQL types. (datetime.*, numeric-decimal,
and more)
* Composite Types and Arrays. Fully structured for easy access.
* Row-objects returned by cursors support
Mapping and Sequence interfaces. (row[colname], row[0])
* Over 150 tests and counting!
Sample PG-API code via pg_python:
$ pg_python -h localhost -U postgres -d postgres
Backslash Commands:
\? Show this help message.
\E Edit a file or a temporary script.
\e Edit and Execute the file directly in the context.
\i Execute a Python script within the interpreter's context.
\setConfigure environment variables. \set without arguments to
show all
\x Execute the Python command within this process.
Python 3.0.1+ (release30-maint:70204M, Mar 5 2009, 21:28:06)
Type help, copyright, credits or license for more information.
(ExtendedConsole)
ps = db.prepare('select 1')
ps()
[(1,)]
ps.first()
1
c = ps.declare()
c.read()
[(1,)]
c.seek(0)
c.read()
[(1,)]
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