Category Archives: Pylons
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The development version of the Trip Planner uses a Postgres/PostGIS backend (instead of MySQL) SQLAlchemy Buy cialis without prescription, as the ORM (instead of raw SQL), and PCL for Python geometry types (instead of our own ugly hacked versions).
Question: How do you move geometries out of Postgres/PostGIS into PCL types via SQLAlchemy and vice versa, Osta cialis. Buy cheap cialis online, Answer: Create a custom geometry column type.
Here's our SQLAlchemy geometry type definition and subtypes (points, buy cialis, New Hampshire NH N.H. , linestrings, and multilinestrings; adding other types should be trivial):
Look here for an example of using it:
The type is pretty simple, California CA Calif. . αγοράζουν online cialis, The only tricky part was figuring out how the database stores the geometry. It's in ASCII hex, cialis online stores, Buy cialis pills, so we use binascii.a2b_hex to get a binary representation and feed that to the PCL fromWKB factory. In the other direction we use binascii.b2a_hex on the WKB representation of the PCL geometry, αγοράσετε cialis. Billig kaufen cialis, [8/7/09: Updated links to source code. Note: latest version uses Shapely, order cialis, Cheap cialis no prescription, not PCL.]. Buy cialis without prescription. Vermont VT Vt. . Comprar cialis baratos. Order cialis online without prescription. Minnesota MN Minn. . Farmacia cialis baratos. Ordering cialis overnight delivery. West Virginia WV W.Va. . Buy cialis online legally. Cialis pedido en línea. Purchase cialis. Ordering cialis from canada. Connecticut CT Conn. .
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Order soma without prescription, For a while now I've been planning to start using one of the many available Python Web frameworks in the development of the trip planner. Over the course of the project we have built an ad hoc, acheter soma discount, California CA Calif. , application-specific, CGI framework (of sorts), soma online cheap. φτηνές φαρμακείο soma, Using a "real" framework will allow us to stop refining those wheels we reinvented and instead focus more on the specifics of our application.
Deciding which framework to use has been tough, Koop korting soma. Billige soma apotek, In the past year or so it seems Web frameworks have become all the rage, with several interesting Python projects and all the Ruby on Rails hype, comprar soma. I had initially narrowed it down to two choices, having researched just about all the competitors: TurboGears and Django, order soma without prescription. Generic soma, I don't remember Pylons in that first round of research, but maybe I just missed it, New Hampshire NH N.H. . Acquistare a buon mercato soma, Once I noticed it, it was added to the list too, pharmacie soma bon marché. Hawaii HI , So, the idea had been floating around for a while and I had created several test applications with various frameworks but still hadn't gotten around to making a definite decision and switching over, order soma without prescription. Soma farmacia a buon mercato, Recently, I listened to a podcast interview of Guido van Rossum[1], Osta soma. Order soma without prescription, In it he mentioned that Django is his favorite Web framework. Soma over the counter, He didn't say much about why except that he likes the way the project is being run. ("They really get open source.")
Having heard that and having also narrowed the field to just Pylons versus Django, acheter soma, Soma en ligne afin, I decided, "OK, cheapest soma in the world, Wisconsin WI Wis. , well I'm going to go ahead with Django then." I ordered up a new Ubuntu VPS[2] to host the new version of the trip planner on and got to work. It was exciting to finally make a decision and move forward, Florida FL Fla. . Soma online kopen, Getting started was easy and I really liked the admin interface, but about five minutes into it, order soma c.o.d., Nebraska NE Nebr. , I realized Django wasn't going to work for me. There was only one reason: the tightly coupled ORM, order soma without prescription. Sure, Idaho ID , I could just not use that part and use a different ORM, but somehow that seems "impure." Maybe that seems silly, but remember that I had only decided to use Django on, essentially, a whim.
The reason I don't want to use the built-in ORM is, I want the Web interface to be orthogonal to the core functionality. I want them completely separate, as they are now in the CGI version. I want to keep database access in the back end and be able to create other interfaces as necessary. Order soma without prescription, Now, I suppose I could just use the Django ORM in the back end (?), but there's another ORM you may have heard of, SQLAlchemy, that I was/am interested in trying out.
This led me back to Pylons and thinking about some of its good points: it's WSGI from the start, Routes seems like a really cool way to map URLs, and the (Myghty) templates use Python.
Thinking about it, Pylons seems more like the "natural" choice for this project and its architecture. On the other hand, I think Django would be great for projects that don't need such separation between the front and back ends (or where there is no back end as such).
I've just gotten started with the CGI=>Pylons conversion and so far it's been a pleasure. I'll report in more detail once I've gotten further into it. One "gotcha" that came up, that I don't think this is specific to Pylons, was creating a controller with the same name as the top-level package. Don't do something like this:
paster create --template=pylons tripplanner
paster controller tripplanner
Python will be unable to import the controller.
[1] The creator of Python (which I mention for non-technical readers)
[2] vpslink.com (seems good so far).
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