By : Javed

The protocol enables XMPP entities to create nodes (topics) at a
pubsub service and publish information at those nodes; an event
notification (with or without payload) is then broadcasted to all ...

By : shabda

I have written the same web app in various web frameworks. Get it from Github.

Copied from the Readme.

This is a set of apps which creates the same application in various Python web micro-frameworks.

The app(s) talks to Facebook, and finds out recent people who have posted a public status with the text "so starving".

This idea came from reading Onion.

We have the same app in these frameworks.

Microframeworks:

• appengine
• flask
• web.py
• juno
• bottle
• itty
• tornado
• pyroutes

Full stack frameworks:

• django
• web2py
• pyramid

If the framework included template engine and caching, that was used directly. Otherwise ...

By : shabda

Django abstracts most of the actions you would be doing with the Database. What it doesn't abstracts, and doesn't try to abstract is the Database modelling part. This is a quick tutorial describing to how model your data in Django models.py, and how to access and modify them.

Consider a hypothetical HR department, which wants you to build an application to track and manage their processes. They have employees who work for a department, contractors who work for multiple department. Let's see how you you would do that in Django.

from django.db import models

class ...

By : shabda

There are some tools and apps which we use with almost all apps we write, and in particular which, we used for dinette. Here they are broken into useful during development, and (also) useful post development.

During Development

1. Ipython and ipdb
2. South
3. Django test utils
4. Django extensions
5. Django debug toolbar

Ipython and ipdb

Ipython is a enhanced shell for python. Ipdb similarly add extra capacity to the builtin pdb debugger. It is extremely convenient to drop into a ipython shell right where a complex piece of code is being hit.

from IPython.Shell import IPShellEmbed
ipython = IPShellEmbed()
ipython()

Of course ...

By : shabda

Foss.in is without doubt India's largest FOSS technology conference. Lakshman gave a talk today on "Python metaclasses and how Django uses them". Here are the slides from that talk.

[Edit] Some reactions,
http://twitter.com/jaideep2588/status/6295483833
http://twitter.com/kunalbharati/status/6296572939

And the talk images, http://twitpic.com/rxhn7

You should follow us on twitter and Subscribe to our blog

By : ashok

This is not yet another Django vs Rails blog post. It is a compilation of notes I made working with Django after having worked on Rails for years.

In this post I want to give a brief introduction to Django project layout from a Rails developer point of view, on what is there, what is not there and where to look for things. It should help a rails developer working on django be able to find the necessary files and underatnd the layout of the project files.

Once you have both the frameworks installed on your system you can create ...

By : shabda

Django has three builtin template loaders which are used to get the templates for rendering.

TEMPLATE_LOADERS = (
    'django.template.loaders.filesystem.load_template_source',
    'django.template.loaders.app_directories.load_template_source',
#     'django.template.loaders.eggs.load_template_source',
)

Writing your template loader is a awfuly easy. It is a callable which

1. Returns a tuple of (openfile, filename) if it can find the template.
2. Raise TemplateDoesNotExist if the templates cannot be found.

The simplest template loader can be

from django.template import TemplateDoesNotExist
def load_template_source(template_name, template_dirs=None):
        try:
            return open(template_name).read(), template_name
        except IOError:
            raise TemplateDoesNotExist, template_name

if you put this to your template loaders directory ...

By : shabda

Slides and code from my talk at twincling.

By : rohit

(If you are in a hurry, here is the fun part.;) A few days ago, I was working with a nullable field, which wasn't behaving as I expected. So I started a shell, and see how nulls compare.

In [1]: None
In [2]: None > 10
Out[2]: False
In [3]: None < 10
Out[3]: True
In [4]: None == None
Out[4]: True

By : lakshman

Thanks to awesome django community, there is plenty of open source django code around.

These packages get updated quite often and if you use it often like we do, you'd have possibly realized the need to manage these packages better.

Thankfully, all python ever needs is the source, and all you need to do is to place the source in the python path.

Most projects use Distributed Version Control Systems like Mercurial and Git, and they come locally with the entire history of the source which provides a lot of control to use any version of the code. For ...

By : shabda

If you used Django for any length of time, you would have come across the login_required decorator. You write @login_required before a view, and it magically becomes accessible only to authenticated users.

Decorators were introduced in python 2.4. PEP 318 is the PEP describing it. At the simplest decorators are nothing but callables returning other callables, and the decorator syntax @decorator is nothing but foo = bar(foo), where both bar and foo are callables.

Let us see some decorators in action.

In [1]: def good_function():
   ...:     print 'I am a good function'
   ...:     
   ...:

In [2]: def decorator(orig_func):
   ...:     def bad_func():
   ...:         print ...

By : shabda

Adrian Holovaty is the co-creator of Django, author of the Django book and is currently the BDFL of Django along with Jacob Kaplan-Moss. He studied journalism at University of Missouri–Columbia and has worked with many news sites including Lawrence Journal World and Washington Post. He currently works at EveryBlock, a startup he founded.

Shabda: Would you tell a little about yourself? You majored in Journalism, how did you move to Programming?

Adrian: Sure! I have a dual background in journalism and computer science. I intended to get a degree in journalism and a minor in computer science, but things ...

By : shabda

Jacob Kaplan-Moss is the co-creator of Django along with Adrian Holovaty, as well as the author of the Django Book. He has been involved with Django since before it was called Django. He is currently employed at Whiskey Media where his job is hacking at Django. He blogs on Jacobian.org. He graciously agreed to be interviewed at the 42topics blog.

Shabda: Would you tell a little about yourself? How did you get started with Django? What other software/applications have you worked with. (Both OSS and otherwise)?

Jacob: So a bit about me: I grew up in Silicon Valley ...

By : shabda

The five things I hate about * meme seems have died down, and memes, should not be allowed to die.

Of course I love Django, and have bet very heavily on it. But we do not know a topic, until we know it warts, so here you go. The listing is in no particular order, so sorry no numbering.

Ajax with Django is hard:

Most of the Django Community has decided that bundling Javascript helpers with a python framework is bad idea. Though I can understand the reasoning, (argued here and rebuttal), that Javascript is so basic that you can not ...

By : shabda

I wrote a new tutorial on building a search engine using Appengine, and Yahoo Search API here. This uses pure Appengine API, and not Django, and is a tutorial on how to use Appengine without Django.

By : shabda

With launch of Google Appengine, there has never been a better time to start a startup. Let not the lack of a business plan or a pitch hold you back. Go to our web 2.0 startup pitch generator, and get your own, custom, startup pitch. Hurry only 24192 available.

The original source for this was written by Nathan and was in Perl. Of course we needed a web2.0 logo for such a marvelous piece of code. This comes from web2.0 logo generator.

The source for this is available here

By : shabda

I have posted two Tutorials for Using Django with Appengine.

• For people who do not know Django
• For people who already know Django see what we build in this tutorial

And here a few good links about the topic.

• James Bennet tells exactly why Appengine and Django are not so good together.
• Ian Bicking has an interesting take on how Appengine can change the economics of Python hosting.
• The guys at Joyent reading my mind on why I or you can not deploy any production site on Appengine. (Hint. you mean I can never move away, without writing half my ...

By : shabda

We are hard at work building 42topics.com, and are looking at the best places to deploy this. So when I heard about Appengine, with out of box Django support(gasp!) I was delighted. After using it for a day, and posting a tutorial, I am so disappointed.

Peeves in no particular order.

• Appengine is a very constrained environment, so out goes any chance to run background jobs.
• The ORM-API is very similar to Django, but yet the Django API is much better. modelobj.filter('attr =', value1).filter('attr2 =', value2) or modelobj.filter(attr = value1, attr2 = value2). Putting entity level ...

By : shabda

Google launched their EC2 competitor, Appengine yesterday, and all hell broke loose. And in about 24 hours, the 10,000 accounts were used up. Currently it is tied to only working with python, and Django 0.96.1 works out of the box. <!- - more - ->

The Good

• Python powered. Django works out of the box.
• No sysadmining chores.
• Promise of infinite scalability with no configuration. (Ah!)
• Free for now.

The Bad

• Python powered, if you want to use ruby/java/php, sorry you are out of luck.
• Your code is tied to Google. You might be able to reuse most of ...