Test Driven Development in Python

By : Anoop Thomas Mathew

We can either prevent bad things from happening or fix it, once it is detected.

It is your choice to select any of these methodology, while developing a software. You can either develop based on a test driven process or the recover from a fiasco with tests.

Test driven development, as the name suggests, is development based on tests. Tests for core features are written prior to the implementation for the expected output, and then necessary modules are written to satisfy the needs define the


Advantages of Test Driven Development

  • application is determined by using it
  • written minimal amount of ...

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Deploying Django apps on Heroku

By : Shabda Raaj

Deploying Django apps on Heroku:

Read this first: http://devcenter.heroku.com/articles/django.

This is a great article by the Heroku. I am just filling in some more details and making this step-by-step.

  1. Get your Django project code.
  2. Create a virtualenv with a no-site-packages command ::

    virtualenv vent --no-site-packages

  3. Install Django, psycopg2 (postgres connector), gunicorn and any other required Django libraries.

  4. Confirm that you have all the required libraries and you can run your code locally using manage.py runserver.
  5. Create a requirement.txt by using ::

    pip freeze > requirements.txt
    
  6. Make sure you have a requirements.txt at the root ...

more info..
Topics : django

Developing android applications from command line

By : Thejaswi Puthraya

Here at Agiliq, we also develop cross-platform HTML5 mobile applications. Using Eclipse to create an android project (one time task) and edit html and javascript files for an android app is an overkill. Wouldn't it be great, if you could use your favourite text editor to edit html and js files and then fall back to the terminal to deploy the android app? We are going to see exactly this in the post.

First, let's install the android SDK starter package(I assume that you have installed JDK and ant). Head over here and install the SDK for ...

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Deploy Django App in 5 Easy Steps

By : Saket Bhushan

So you just bought a new VPS, have installed Ubuntu and want to deploy your django app, GREAT!! We shall get your app, up and running in 5 easy steps, using best(arguably) of tools available. The post is targeted to audience who are new to deployment arena, but assumes you are comfortable with developing basic django apps. We shall be using gunicorn as our server and nginx nginx as our reverse proxy and static hanlder. Here we go:

1. Login and OS Updation:

$ ssh root@{your_ip}

# apt-get update

# apt-get upgrade

# apt-get dist-upgrade

# dpkg-reconfigure tzdata #choose your time zone

2 ...

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Project Management Tools for Start-Ups

By : Anoop Thomas Mathew

An integral part in the success or failure, of any company is the management and communication between peers within the company as well as a well formed communication with the clients itself. 1990s was marked with the rise of tools like bugzilla, trac and a few other, which allowed developers to develop collaboratively, and more over, a bit more organized with the ticketing system. One thing to be noted is that, they did what they were supposed to do, and they still do.

As the time pass by, we got a huge number of code hosting, along with project management ...

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Generating a pdf from an image using PIL and django

By : Saket Bhushan

In this post we shall be performing small image manipulation on the server side and allowing the user to download the pdf. This might be found useful if you design a quiz app and want to generate a certificate for the users. The various methods which can be followed to generate the certificate are:

  1. Have an image file to serve as a template, use css to place the username at the desired location.
  2. Have a pdf file, which can be edited to take the username of the current user if he has passed certain test.
  3. Have an image template ready ...

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Dynamically attaching SITE_ID to Django Caching

By : Anoop Thomas Mathew

It would be useful and convenient, if you have an automatic way to add the SITE_ID, especially, when you have multiple sites running on the same deployment. Django provides a cache prefix function KEY_FUNCTION in settings which can be used to achieve this.

Just follow the following steps, and your cache, automatically prepends SITE_ID to the cache key, making it unique across multiple sites.

  1. Put the following into the settings file.

         CACHES = {
    
         'default': {
    
          'BACKEND': 'django.core.cache.backends.db.DatabaseCache',
    
           'LOCATION': 'cache_table',
    
           KEY_FUNCTION = projectname.appname.modulename.functionname,
    
                    }
    
             }
    
  2. Write a function to get current site id, say, get_current_site(), which returns current ...

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Deploying Django apps on Heroku

By : Shabda Raaj

Read this first: http://devcenter.heroku.com/articles/django.

This is a great article by the Heroku. I am just filling in some more details and making this step-by-step.

  1. Get your Django project code.

  2. Create a virtualenv with a no-site-packages command

    virtualenv vent --no-site-packages
    
  3. Install Django, psycopg2 (postgres connector), gunicorn and any other required Django libraries.

  4. Confirm that you have all the required libraries and you can run your code locally using manage.py runserver.

  5. Create a requirement.txt by using
    pip freeze > requirements.txt
    
  6. Make sure you have a requirements.txt at the root of your repo. Heroku uses ...

more info..
Topics : django

Getting started with South for Django DB migrations

By : Akshar Raaj

South is a migration tool used with Django.There will be times when you would be adding fields to a model or changing the type of field (eg: Field was an IntegerField and you want to change it to FloatField). In such cases syncdb doesn't help and South comes to your rescue.

There were times when i tried "python manage.py migrate southapp", got some error and then tried "python manage.py migrate southapp 0001 --fake". In some cases, that worked. When it did not work, i tried something else and so on. There were confusions regarding what --fake ...

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Topics : django South south

A brief overview of Vagrant

By : Dheeraj Sayala

Vagrant is a very good wrapper around Oracle's VirtualBox. It makes life easier for web developers and the like by providing a nice command-line interface to build, manage, provision, use virtual machines.

Why should you use Vagrant?

  • You may want to install different versions of software without worrying about conflicts
  • You don't want to remember which services to start/stop when you start working on a project
  • The version of Operating system you use can be different from the one on the server. So, you want a way to emulate the behavior on server
  • You want to develop ...

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Writing jQuery plugins using Coffeescript

By : Shabda Raaj

So you want to write a Jquery plugin. If you know jQuery and Coffeescript, this would be amazingly easy.

I will walk you through writing a jQuery plugin which will allow us to add alternating colors to alternating rows.

Here is the plugin in its entirety.

$ = jQuery
$.fn.zebraTable = (options) ->
    defaults = 
        evenColor: '#ccc'
        oddColor : '#eee'

    options = $.extend(defaults, options)
    @each ->
        $("tr:even", this).css('background-color', options.evenColor)
        $("tr:odd" , this).css('background-color', options.oddColor)

Lets look at what we did.

  1. We bound $ to jQuery object.
  2. We created an anonymous functions and added this to jQuery, by assigning it to $.fn ...

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Topics : coffeescript

Behind the Scenes: Request to Response

By : Thejaswi Puthraya

In the previous installment of "Behind the Scenes", we saw how the control flows from Form to File Storage. Today, we are going to see how the application reacts from request to response.

In this post, we are going to assume that we are using django's inbuilt runserver. The flow doesn't change much for other WSGI servers available.

When you invoke the runserver management command, the command line options are validated and an instance of WSGIServer is created and passed the WSGIRequestHandler, which is used to create the request object (WSGIRequest). After the request object is created and ...

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Using SQLite Database with Android

By : Bala Subrahmanyam Varanasi - Where there's a will, there's a way.

Android embeds an Open Source Database called SQLite, which supports standard relational database features like SQL syntax, transactions and prepared statements. In addition it requires only little memory at runtime (approx. 250 KB). In this post I would like to show how to work with a simple pragmatic example : Baby Names App.

Before writing the code, let me show you some of the screen-shots of Baby Names App, which requires interaction with the database.

  1. When ever you launch the App, it will shows a Menu of items as below. Baby Names App Menu

  2. When we click on the highlighted button - "Common Names", it will ...

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Topics : android java

Haml for Django developers

By : Shabda Raaj

Haml is taking the Ruby(and Rails) world by storm. Its not used as heavily by Python(and Django) developers as the Python solutions aren't as mature. I finally gave Haml a try and was pleasantly surprised how easy it was.

The most mature Python implementation of Haml is hamlpy, which converts the hamlpy code to Django templates. Others are shpaml and GHRML

Lets look at some templates from Django tutorial

{% if latest_poll_list %}
    <ul>
    {% for poll in latest_poll_list %}
        <li><a href="/polls/{{ poll.id }}/">{{ poll.question }}</a></li>
    {% endfor %}
    </ul>
{% endif %}

Here is this template converted to Haml

-if ...

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Topics : django

Coffeescript for Python programmers

By : Shabda Raaj

I just learnt Coffeescript, and as a Python programmer loved being able to write Javascript in a Python like language. Coffeescript is inspired by Python/Ruby and is very close to these languages. Writing Coffeescript and reading the compiled Javascript also improved my understanding of Javascript. Without much ado here is translation of some Python code to Coffeescript to get you started.

Defining a variable

Python
a = 10

Coffeescript
a = 10

Setting scope is done via whitespaces.

Python

if i == 10:
    foo()

Coffeescript

if i == 10
    foo()

No semicolons

List comprehensions

Python

languages = ["Python", "Coffeescript", "Java", "Ruby", "Haskell"]
languages = [lan ...

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Topics : coffeescript

How to use jsTree

By : Akshar Raaj

Using jsTree

Problem Statement:

To show a TreeView (hierarchical view of information) structure in a Web page.

I came across this problem when i was required to develop a web application which allows its users to store contacts and their related information(name, email, phone). The contacts would go into a folder and any folder can have any number of subfolders and any subfolder can have any number of contacts. Also, the folder structure can be nested as many levels deep as the user wants. So, how do you show the folder structure in a Web Page?

You might encounter ...

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Behind the Scenes: From HTML Form to Storage

By : Thejaswi Puthraya

In this post, we are going to see what happens behind the scenes when a file is uploaded to a django powered web application.

File Upload Flow

An HTML form with a file input (atleast one) and encoding set to multipart/form-data is submitted. The MultiPartParser parses the POST request and returns a tuple of the POST and FILES data (request.POST, request.FILES). The MultiPartParser processes the uploaded data using the File Upload Handlers objects (through the new_file, receive_data_chunk and upload_complete methods). The request.FILES values are a sequence of instances of UploadedFile.

In the django form, we pass the request.FILES ...

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Topics : django files upload

Setting up your system to start with Django development on Ubuntu:

By : Akshar Raaj

1>Being a Python web framework, Django requires Python. If you are on ubuntu, you probably have python installed on your system. If you don't have it installed, give the following command from the terminal:

sudo apt-get install python

This will install Python on your machine.

2>If you will be developing a database driven web application, you need to have a database setup on your system. I feel mysql is good and will tell you about installing mysql. It is pretty easy to install and use. You need to issue the following command from terminal:

sudo apt-get install ...

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Topics : django setup mysql
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Django: csrf error on non-existent urls

By : Javed Khan

While testing out a API from another django site, I came across a seemingly common error.

403 Forbidden

CSRF verification failed. Request aborted.

Help

Reason given for failure:

    No CSRF or session cookie.

Posting the data to the api endpoint returned 403 Forbidden with the standard csrf failure error page. I cross checked that the view was csrf_exempted and that CsrfViewMiddleware was not enabled. The view had some other unrelated decorators which I guessed could be the cause of the problem. According to this bug, not all decorators play nice with the csrf_exempt decorator. Even with that fixed, there was ...

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Writing an e-mail application with Lamson - II

By : Thejaswi Puthraya

In the last post, we saw how to create the skeleton of a basic email application using Lamson. In this part, we'll see how to write a handler (in the controller) to open a ticket in Unfuddle, the project management tool we use at Agiliq.

If you look at the config/settings.py file, you'll see a handlers attribute that should be updated to match the file that contains the rules for mail routing. In this case, let us create a unfuddle.py under the app/handlers directory and update the config/settings.py:

handlers = ["app.handlers.unfuddle ...

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Topics : lamson e-mail
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Writing an e-mail application with Lamson - I

By : Thejaswi Puthraya

Off late, we've been slightly busy with a 'lot' of new developments on our end and we've not been able to devote attention to the blog. In these busy periods, we tend to forget things faster. One such thing that Shabda recently pointed out that a couple of our applications (client and open source project) were raising exception. Because of the low frequency of these errors, they went unnoticed for quite a few days. We do check e-mail often but we are mostly drowned in our project management tool, Unfuddle. Shabda suggested we open a ticket for every ...

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Topics : lamson e-mail
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