Building Pyramid Applications

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A guest post by Wayne Witzel III who resides in Florida and is currently working for Slashdot Media as a Senior Software Engineer building backend systems using Python, Pylons, mongodb, and solr. He can be reached at @wwitzel3.

Pyramid, an unopinionated Python web framework, by its very nature, does not attempt to enforce a specific way for laying out and developing your application. That said, there are some idioms you can follow to ensure that as you build your application it stays maintainable and easy to test.

Request Attributes

One thing you will notice when using Pyramid is that the request object is explicitly passed around to where it is needed. This makes it a great place for objects that you commonly use with each request. As of Pyramid 1.4 there is a great Configurator method: add_request_attribute. This method makes it easy to add custom request object attributes. Here is a simple example of using this method to attach your database session to the request as an attribute.

First we create our engine and setup our metadata bindings:

# main method engine = engine_from_config(settings, 'sqlalchemy.') DBSession.configure(bind=engine) Base.metadata.bind = engine

Now we create a simple callback method and pass it to add_request_attribute. We also pass the string name, which is the desired attribute name. reify=True, which we also pass, ensures that the result of evaluating get_db is cached for the life of the request:

def get_db(request): return DBSession config.add_request_attribute(get_db, 'db', reify=True)

Now anywhere we have access to our request object, which can be views or other request attributes, we also have access to our database session via the request.db attribute.

Creating Components

Creating a component in Pyramid is as easy as defining an includeme callable. This convention is used by Configurator.include, which supports being called with an actual module or a dotted path.

import mycomponent config.include(mycomponent) config.include('myother.component')

Again, any standard Python module or file can be made to support being used with a Pyramid Configurator object by defining an includeme callable. For example, it is common to separate the functional areas for your application in to different Python modules. We can then define an includeme method in the __init__.py for the module to setup any special things we might need.

pinto is a very simple blogging application created using Pyramid for the purpose of demonstrating this convention. pinto builds components for each of the different functions of the application. Then it includes each component within the application’s main method to build out the entire set of features. The result is a very clean and simple main method, with things setting up routes or adding custom request attributes living off in their own dedicated modules.

To show you an example of what this looks like, I want to take a look at the post component of the pinto application. post will be tasked with creating the routes and views for the CRUD part of our blogging system.

Source: blog.safaribooksonline.com

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My 2 cents...

Interesting thread, I guess I should add my 2 cents here too--
I'm a sales agent...so here's some personal and shared experiences. I'm not sure who is actually a licensed agent in these postings.
Studies show commission sales jobs are one of the highest grossing jobs out there, due to the unlimited earning potential. I do mainly sales, and we typically charge 4-7% on a sales listing. For the poster who sold his house in 1992 for $120,000 -- as you said, that was in 1992, 12 years ago. The economy has grown in the past 12 years, obviously. Which is why we pay $2 for the subway instead of 75 cents, meanwhile the subways are still the subways from the 1980's

Jump on anyone who will meet them??

This has *not* been my experience. While I have had some nice experiences with online dating (one "dating situation" and one that ended up being a good friend....and yes something ongoing that was sexual in nature), I tend to be pretty dammned selective *before* I ever meet someone (though no longer in the sense of endless IMs and emails....lesson learned. TWICE). And yes, even after I meet someone, I'm still pretty selective.
I agree that I do have difficulty meeting people in person sometimes as I tend to be shy. I also tend to be a bit on defense in typical "bar settings", and I know that makes it diffucult for guys to approach

I probably should and I probably will

I know very little about it. Thankfully this is has never been a problem for me before.
The fact still stands that a feral cat colony is a huge nuisance in my area. I would probably consider this a 'high risk of painful death' area. My street dead ends into a sound barrier wall and on the other side of that wall is one of he busiest highways in my area. Not to mention the traffic on the city roads. I'd still prefer to see a cat humanely euthanized than hit by a car - the latter happens far too often as it is so the 'vacuum' is going to be created in both instances

SFBC Biker Bulletin - October 23, 2001

SF Bicycle Coalition Biker Bulletin - October 23, 2001
Subscribe and get other member benefits by joining the SFBC today!
* TABLE OF CONTENTS
-----------------------
1) CALL FOR JUSTICE TODAY
2) BIKE LANES IN OUTER MISSION / EXCELSIOR?
3) HELP KEEP THE PRESIDIO BIKE-FRIENDLY
4) SPREAD THE WORD: PUT UP A BIKE FLYER
5) STOP THE BIKE RESTRICTIONS ON GG BRIDGE!
6) HELP STEER THE SFBC: JOIN THE BOARD OF DIRECTORS
7) SFBC OFFICE WARMING PARTY NEXT MONDAY
8) VALET PARKERS NEEDED AT SFLNC RALLY
9) THIS WEEK'S EVENTS
-----------------------
1) CALL FOR JUSTICE TODAY
Nearly a year has passed since a truck driver hit and killed Chris Robertson, a much-loved bicyclist and member of the SFBC

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  • Avatar k332 Where can I read Dr. Seuss books online?
    Oct 05, 2009 by k332 | Posted in Books & Authors

    I need a copy of The Cat in the Hat but I can't find it anywhere online. Help! Thanks.

    • You can buy it easily through this safe link (use high broadband if you have it) and follow the easy route to "Books" and click on that... You'll see a list of titles then and click on The Cat in the Hat to buy …anch of the public library and ask for the children's reference librarian. Ask him or her if they have this ready for download against your library card. Many libraries do this now. Mine doesn't, so I'm not sure of cost.

  • Avatar madison I'm hosting a seuss party with my reading buddys. For only 30 minutes what can i do to keep with the theme???
    Mar 01, 2007 by madison | Posted in Primary & Secondary Education

    Their in second grade

    • There are so many fabulous activities you can do, this is such a fun theme!

      When we did this for Dr. Seuss Day we set up several different stations for students to rotate through. This was a few years ago, … character. Draw it. Name it. Write a short story/poem about it.

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