Django community: RSS
This page, updated regularly, aggregates Community blog posts from the Django community.
-
Djangocon: Switching from nose to py.test at Mozilla - Mathieu Agopian
(One of the summaries of a talk at the 2015 Djangocon EU conference). Mathieu Agopian likes py.test much more than regular python unittests or nose. A bit of terminology. A test is a piece of code written to assert that another piece of code is behaving as expected. Test runner: gathers test and runs them. Test suite (or "a built"): full collection of tests to run. py.test is already quite old and it is now maintained by a big team. One of the handy features is tests written without boilerplate. assert 1 + 1 == 2 works! No need for self.assertEquals(). There is a plugin system. Like nose, it doesn't show output if the test runs OK. If a test fails, py.test provides awesome error reports. "This item misses from the second dict" instead of only showing the two dicts, for instance. Test fixtures are done via dependency injection: you just pass a fixture to the test function. No need for testSetup() and testTeardown(). You can run the same test with multiple parameters. Plugins? For instance pytest-django, which runs createdb for you. pytest-cache is another good one. It allows you to run the tests with the --lf, "last failed", option. … -
Djangocon: Baptiste's adventures in Djangoland - Baptiste Mispelon
(One of the summaries of a talk at the 2015 Djangocon EU conference). Baptiste Mispelon spend 2014 roaming around in djangoland. Djangoland? Esperanto is a language invented by Zamenhoff, a polish guy. There's a "Esperantujo" concept: "esperanto-land". Once you meet someone who speaks that invented language, you're in esperanto-land. It is the same with django. Once you meet people who program django or if you're on the IRC channel, you're in djangoland. He told a bit about his history. Dropped out of school in France in 2009 and moved to Hungary towards his girlfriend. After a period of doing nothing, he started making php websites. Afterwards he discovered python. He attended the djangocon in Zürich (2012). His first conference. He stayed for the sprint: this was the best decision of his whole career. He met lots of people and felt welcomed. And learned a lot. A couple of months later he got in his first pull request to core django (a one-character documentation fix). In 2013, he started diving deeper and deeper into the code and solving more and more issues. He attended djangocon again, the "django circus" in Warsaw. Because of his many patches, he got invited to join … -
Dreaming big?
Optional Reality's Dreaming Big Challenge has come to an end. This was a challenge about designing a "sales pitch" in 600 words or less for a text-based online roleplaying game. This is the kind of pitch you'd tease knowledgeable investors with - if investors cared about multiplayer text games and you ended up in an elevator with one, that is. There were 10 entries to the competition and as the results are now in (including very elaborate judge feedback!), I encourage you to go read all the entries. The focus was on originality and fresh ideas and maybe these short pitches represent a cross-section of the current trends or a whiff of where the wind is blowing for future games. Or maybe it will help inspire you to make a sales pitch of your own.You can find all the entries linked from the second post of this thread. Enjoy! -
Dynamic Models in Django-Part1 (adding new fields to models from admin)
Sometimes at the production level, there may be a chance of adding new fields to our model.With the normal Django models when we add a new field to the model, the database is not able to identify the new field.To make database identify the new field we have to drop the existing database from the database and sync our application again.During the time of production, it is not possible to remove the existing data. The solution for this is Django-eav.With this, we can add any no of fields to our models on fly. Steps To add New fields to the models Using Django-eav: Step1: Install Django-eav using the following command pip install -e git+git://github.com/mvpdev/django-eav.git#egg=django-eav Step2: Add 'eav' to your INSTALLED_APPS in your project’s settings.py file. Step3: Register your models with eav. To register any model with EAV, you simply need to add the registration line somewhere that will be executed when Django starts: import eav eav.register(Patient) Keep the above lines anywhere in your models.py Step4: Configure your models so that you can create new fields from admin itself You can even have your eav attributes show up just like normal fields in your model's admin pages. Just register using the eav admin class: from django.contrib … -
E-commerce (paypal) integration with Django
E-commerce is integration is becoming almost essential for every web application nowadays. There are so many payment gateways to integrate with our application. Some of them are Amazon payments, Asiapay, BPAY, Brain Tree, PayPal ...etc. Out of these now in this, we'll see how to integrate Paypal with our Django Application. Integrating Paypal with Django: Paypal provides two kinds of API for integrating any application with it. They are 1.PayPal REST API 2.PayPal CLASSIC API 1. Integrating with REST API: Integrating PayPal with Django with REST API is somewhat easy and easy to understand. Paypal provides an SDK for integrating PayPal with Django, that is 'PayPal rest SDK'. For more about restsdk check this https://github.com/paypal/rest-api-sdk-python and https://developer.paypal.com/webapps/developer/docs/api/ 2.Integrating Paypal with classic API: First, initialize the PayPal URLs for endpoint and PayPal connection as follows. End_url = 'https://api-3t.sandbox.paypal.com/nvp' PAYPAL_URL = 'https://www.sandbox.paypal.com/webscr&cmd=_express-checkout&token=' Buyers use Express Checkout to pay you on PayPal's secure site and return to your site to complete the transaction. 1.Setting express checkout for the transaction: params = { 'USER' : 'xxxxxxxx', # Edit this to your API user name 'PWD' : 'xxxxxxxx', # Edit this to your API password 'SIGNATURE' : 'AFcWxV21C7fd0v3bYYYRCpSSRl31A0ltbCXAvF44j6B.kUqG3MePFr40', 'METHOD':'SetExpressCheckout', 'VERSION':86, 'PAYMENTREQUEST_0_PAYMENTACTION':'SALE', # type of payment 'PAYMENTREQUEST_0_AMT':50, # amount of transaction 'PAYMENTREQUEST_0_CURRENCYCODE':'USD', 'cancelUrl':"xxxxxxxxxxxxx", … -
E-commerce (paypal) integration with Django
E-commerce is integration is becoming almost essential for every web application now a days. There are so many payment gateways to integrate with our application. Some of them are Amazon payments, Asiapay, BPAY, Brain Tree, PayPal ...etc. Out of these now in this we'll see how to integrate Paypal with our django Application. Integrating Paypal with Django: Paypal provides two kinds of api for integrating any application with it. They are 1.PayPal REST api 2.PayPal CLASSIC api 1. Integrating with REST api: Integrting paypal with dajngo with REST api is some what easy and easy to understnad. Paypal provides a sdk for integrating PayPal with Django, that is 'paypal rest sdk'. For more about restsdk check this https://github.com/paypal/rest-api-sdk-python and https://developer.paypal.com/webapps/developer/docs/api/ 2.Integrating Paypal with classic api: First intialise the paypal urls for endpoint and paypal connection as follows. End_url = 'https://api-3t.sandbox.paypal.com/nvp' PAYPAL_URL = 'https://www.sandbox.paypal.com/webscr&cmd=_express-checkout&token=' Buyers use Express Checkout to pay you on PayPal's secure site and return to your site to complete the transaction. 1.Setting express checkout for transaction: params = { 'USER' : 'xxxxxxxx', # Edit this to your API user name 'PWD' : 'xxxxxxxx', # Edit this to your API password 'SIGNATURE' : 'AFcWxV21C7fd0v3bYYYRCpSSRl31A0ltbCXAvF44j6B.kUqG3MePFr40', 'METHOD':'SetExpressCheckout', 'VERSION':86, 'PAYMENTREQUEST_0_PAYMENTACTION':'SALE', # type of payment 'PAYMENTREQUEST_0_AMT':50, # amount of … -
Dynamic Models in Django-Part1 (adding new fields to models from admin)
Some times in the production level there may be a chance of adding new fields to our model.With the normal django models when we add new field to the model the database is not able to identify the new field.To make database identify the new field we have to drop the existing database from the database and sync our application again.During the time of production it is not possible to remove the existing data. The solution for this is Django-eav.With this we can add any no of fields to our models on fly. Steps To add New fields to the models Using django-eav: Step1:Install django-eav using the following command pip install -e git+git://github.com/mvpdev/django-eav.git#egg=django-eav Step2:Add 'eav' to your INSTALLED_APPS in your project’s settings.py file. Step3:Register your models with eav. To register any model with EAV, you simply need to add the registration line somewhere that will be executed when django starts: import eav eav.register(Patient) Keep the above lines any where in your models.py Step4:Configure your models so that you can create new fields from admin it self You can even have your eav attributes show up just like normal fields in your models admin pages. Just register using the eav admin class: from django.contrib import admin … -
Djangocon by train (plus travel tips)
I'm busy packing my bags right now. One large backpack and my regular laptop backpack. And a small money belt. The laptop bag is what I use daily. Going to a conference practically forces me to empty it out completely. Only time during the year that it happens. So that's a good thing. During the conference, I use it for my laptop, power cable, the programme, a water bottle and my jacket. For conferences, you often walk quite a bit through a city, so a proper backpack is way preferrable. During travel, this is what I use for everything I need to have handy, like extra snacks, a book, earphones, the printed-out hotel booking, etc. The large backpack is for my spare clothes, spare book, tooth brush. The regular stuff. I much prefer a big backpack to some trolley on little wheels I have to drag behind me. It might not look so "standard", but that doesn't matter much to me. It is simply more practical. Though, I must confess, the combination of two backpacks naturally leaves a little bit to be desired :-) The money belt is actually not the belt-around-the-waist type, but a small flat bag that hangs … -
Newsletter #5
Welcome to the latest news about Two Scoops Press, Daniel Roy Greenfeld (pydanny), and Audrey Roy Greenfeld (audreyr). Two Scoops of Django 1.8 is in Print We're happy to announce that the print edition of Two Scoops of Django 1.8 is now available as a physical, printed book. We're taking pre-orders now, to begin shipping on Friday, June 5th (that's when the books begin arriving at our house). Purchase Two Scoops of Django 1.8 Print Paperback in our shop In addition to the print book, we've also added a print/ebook bundle that is US$24.95 cheaper than if you bought the book and PDF separately. If you purchased the Early Release PDF, you will be receiving an email containing a discount code that works in our store worth US$24.95 off the print edition. We couldn't have done this without the encouragement of friends from around the world, or the contributors who so diligently submitted changes and corrections. From the bottom of our hearts, we thank you. You can also purchase Two Scoops of Django 1.8 on Amazon. You should be able to purchase the printed book on Amazon.in and Flipkart soon. If you have any questions, please read the Two Scoops … -
Newsletter #5
Welcome to the latest news about Two Scoops Press, Daniel Roy Greenfeld (pydanny), and Audrey Roy Greenfeld (audreyr). Two Scoops of Django 1.8 is in Print We're happy to announce that the print edition of Two Scoops of Django 1.8 is now available as a physical, printed book. We're taking pre-orders now, to begin shipping on Friday, June 5th (that's when the books begin arriving at our house). Purchase Two Scoops of Django 1.8 Print Paperback in our shop In addition to the print book, we've also added a print/ebook bundle that is US$24.95 cheaper than if you bought the book and PDF separately. If you purchased the Early Release PDF, you will be receiving an email containing a discount code that works in our store worth US$24.95 off the print edition. We couldn't have done this without the encouragement of friends from around the world, or the contributors who so diligently submitted changes and corrections. From the bottom of our hearts, we thank you. You can also purchase Two Scoops of Django 1.8 on Amazon. You should be able to purchase the printed book on Amazon.in and Flipkart soon. If you have any questions, please read the Two Scoops … -
Newsletter #5
Welcome to the latest news about Two Scoops Press, Daniel Roy Greenfeld (pydanny), and Audrey Roy Greenfeld (audreyr). Two Scoops of Django 1.8 is in Print We're happy to announce that the print edition of Two Scoops of Django 1.8 is now available as a physical, printed book. We're taking pre-orders now, to begin shipping on Friday, June 5th (that's when the books begin arriving at our house). Purchase Two Scoops of Django 1.8 Print Paperback in our shop In addition to the print book, we've also added a print/ebook bundle that is US$24.95 cheaper than if you bought the book and PDF separately. If you purchased the Early Release PDF, you will be receiving an email containing a discount code that works in our store worth US$24.95 off the print edition. We couldn't have done this without the encouragement of friends from around the world, or the contributors who so diligently submitted changes and corrections. From the bottom of our hearts, we thank you. You can also purchase Two Scoops of Django 1.8 on Amazon. You should be able to purchase the printed book on Amazon.in and Flipkart soon. If you have any questions, please read the Two Scoops … -
Improved Django Tests
Improved Django Tests -
Celery With Supervisor
Celery: Celery is a task queue with focus on real-time processing,while also supports task scheduling. Task queues are used as mechanisms to distribute work across multiple threads or machines. A task queues input is a unit of work called a task,dedicated worker processes and constantly moniter the queue for new work to perform. Celery communicates via messages using a broker to mediate between workers and clients.To initiate a task client puts a message on the queue, then the broker delivers that message to a worker. Note: You can get more about celery http://celery.readthedocs.org/en/latest/django/first-steps-with-django.html To run celery in virtual environment need to type the following command in your virtual environment export C_FORCE_ROOT="true" Running the worker with supervisor In production you will want to run the worker in the background as a daemon and some times there may be a chance of stopping of celery worker automatically then it should be restarted automatically. To do thes tasks you need to use the tools provided like supervisord. First, you need to install supervisor in your virtualenv and generate a configuration file. $ pip install supervisor $ cd /path/to/your/project $ echo_supervisord_conf > supervisord.conf Next, just add the following section in configuration file: … -
Django Girls Ensenada 2015
Since the first Django Girls event I've watched the movement grow with a sense of of awe and inevitability. There is something about it that is both contagious and powerful, and in a very good way. This past weekend I had my first chance to attend one of their events in Ensenada, Mexico. This is what we saw. A room full of attendees with laser focus. The coaches were clearly inspired by the dedication of the women who had come to learn and grow. #djangogirls A photo posted by Daniel Greenfeld (@pydanny) on May 26, 2015 at 7:42am PDT By the end of the day, the energy hadn't dwindled, it had accelerated. Saying goodbye to #djangogirls Ensenada. Everyone stayed until the very end. A photo posted by Daniel Greenfeld (@pydanny) on May 26, 2015 at 8:10am PDT No one wanted the day to end. #djangogirls Ensenada attendees so dedicated they stayed after the event finished! :-) A photo posted by Daniel Greenfeld (@pydanny) on May 26, 2015 at 8:14am PDT We did our small part. We coached and did our best to give an invited inspirational talk. Programming Gives You Superpowers from Audrey & Daniel Roy Greenfeld The Django Girls … -
My First Django Girls Event
Since the first Django Girls event I've watched the movement grow with a sense of of awe and inevitability. There is something about it that is both contagious and powerful, and in a very good way. This past weekend I had my first chance to attend one of their events in Ensenada, Mexico. This is what we saw. A room full of attendees with laser focus. The coaches were clearly inspired by the dedication of the women who had come to learn and grow. #djangogirls A photo posted by Daniel Greenfeld (@pydanny) on May 26, 2015 at 7:42am PDT By the end of the day, the energy hadn't dwindled, it had accelerated. Saying goodbye to #djangogirls Ensenada. Everyone stayed until the very end. A photo posted by Daniel Greenfeld (@pydanny) on May 26, 2015 at 8:10am PDT No one wanted the day to end. #djangogirls Ensenada attendees so dedicated they stayed after the event finished! :-) A photo posted by Daniel Greenfeld (@pydanny) on May 26, 2015 at 8:14am PDT We did our small part. We coached and did our best to give an inspirational talk. Programming Gives You Superpowers from Audrey & Daniel Roy Greenfeld The Django Girls Ensenada … -
Django Girls Ensenada 2015
Since the first Django Girls event I've watched the movement grow with a sense of of awe and inevitability. There is something about it that is both contagious and powerful, and in a very good way. This past weekend I had my first chance to attend one of their events in Ensenada, Mexico. This is what we saw. A room full of attendees with laser focus. The coaches were clearly inspired by the dedication of the women who had come to learn and grow. #djangogirls A photo posted by Daniel Greenfeld (@pydanny) on May 26, 2015 at 7:42am PDT By the end of the day, the energy hadn't dwindled, it had accelerated. Saying goodbye to #djangogirls Ensenada. Everyone stayed until the very end. A photo posted by Daniel Greenfeld (@pydanny) on May 26, 2015 at 8:10am PDT No one wanted the day to end. #djangogirls Ensenada attendees so dedicated they stayed after the event finished! :-) A photo posted by Daniel Greenfeld (@pydanny) on May 26, 2015 at 8:14am PDT We did our small part. We coached and did our best to give an invited inspirational talk. Programming Gives You Superpowers from Audrey & Daniel Roy Greenfeld The Django Girls … -
Cakti at CRS ICT4D 2015
This is Caktus’ first year taking part in the Catholic Relief Service’s (CRS) Information and Communication Technologies for Development (ICT4D) conference. The theme of this year’s conference is increasing the impact of aid and development tools through innovation. We’re especially looking forward to all of the speakers from organizations like the International Rescue Committee, USAID, World Vision, and the American Red Cross. In fact, the offerings are so vast, we thought we would provide a little cheat sheet to help you find Cakti throughout this year’s conference. -
PyPy.js: What? How? Why? by Ryan Kelly (PyCon 2015 Must-See Talk: 5/6)
Part five of six in our PyCon 2015 Must-See Series, a weekly highlight of talks our staff enjoyed at PyCon. From Ryan Kelly’s talk I learned that it is actually possible, today, to run Python in a web browser (not something that interprets Python-like syntax and translates it into JavaScript, but an actual Python interpreter!). PyPy.js combines two technologies, PyPy (the Python interpreter written in Python) and Emscripten (an LLVM-to-JavaScript converter, typically used for getting games running in the browser), to run PyPy in the browser. This talk is a must-see for anyone who’s longed before to write client-side Python instead of JavaScript for a web app. While realistically being able to do this in production may still be a ways off, at least in part due to the multiple megabytes of JavaScript one needs to download to get it working, I enjoyed the view Ryan’s talk provided into the internals of this project. PyPy itself is always fascinating, and this talk made it even more so. -
My First Django Girls Event
Since the first Django Girls event I've watched the movement grow with a sense of of awe and inevitability. There is something about it that is both contagious and powerful, and in a very good way. This past weekend I had my first chance to attend one of their events in Ensenada, Mexico. This is what we saw. A room full of attendees with laser focus. The coaches were clearly inspired by the dedication of the women who had come to learn and grow. #djangogirls A photo posted by Daniel Greenfeld (@pydanny) on May 26, 2015 at 7:42am PDT By the end of the day, the energy hadn't dwindled, it had accelerated. Saying goodbye to #djangogirls Ensenada. Everyone stayed until the very end. A photo posted by Daniel Greenfeld (@pydanny) on May 26, 2015 at 8:10am PDT No one wanted the day to end. #djangogirls Ensenada attendees so dedicated they stayed after the event finished! :-) A photo posted by Daniel Greenfeld (@pydanny) on May 26, 2015 at 8:14am PDT We did our small part. We coached and did our best to give an inspirational talk. Programming Gives You Superpowers from Audrey & Daniel Roy Greenfeld -
Django interview questions ...
... and some answers Well I haven't conducted any interviews recently but this one has been laying in my drafts for a quite while so it is time to take it out of the dust and finish it. As I have said in Python Interview Question and Answers these are basic questions to establish the basic level of the candidates. Django's request response cycle You should be aware of the way Django handles the incoming requests - the execution of the middlewares, the work of the URL dispatcher and what should the views return. It is not necessary to know everything in the tiniest detail but you should be generally aware of the whole picture. For reference you can check "the live of the request" slide from my Introduction to Django presentation. Middlewares - what they are and how they work Middlewares are one of the most important parts in Django. Not only because they are quite powerfull and useful but also because the lack of knowledge about their work can lead to hours of debugging. From my experience the process_request and process_response hooks are the most frequently used and those are the one I always ask for. You should … -
Squashing and optimizing migrations in Django
With Django 1.7 we got built in migrations and a management command to squash a set of existing migrations into one optimized migration - for faster test database building and to remove some legacy code/history. Squashing works, but it still has some rough edges and requires some manual work to get the best of a squashed migration. Here are few tips for squashing and optimizing squashed migrations. -
Function caching decorator [reprise]
Sudden inspiration to write a blog. A long time ago, I wrote a post about a decorator that could somehow cache an expensive function. There were some ideas in the comments, but I never really followed up the idea I spawned in that particular post. And I never really gave it more thought or research either. Today I was at the PyGrunn conference. Tom Levine, author of Vlermv, held a presentation about that package. He told there that he wrote a decorator called `cache` (ctrl+f on the page I linked) that he uses for the exact same goal as I wrote my original post. He also noted that `cache` would probably be a bad name for a decorator like that. At the end of the presentation there was some time where people could ask questions. A lot of people gave Tom tips on packages he could look into and there was one helpful attendant who called out Python's `memoised` decorator. I noted that one of the commenters on my original post also named memoize, but that commenter linked to a decorator inside a Plone package. I searched a bit on the internet today and there's a class inside the PythonDecoratorLibrary … -
Pygrunn: Orchestrating Python projects using CoreOS - Oscar Vilaplana
(One of the summaries of the 2015 Pygrunn conference) (Note: Oscar Vilaplana had a lot of info in his presentation and also a lot on his slides, so this summary is not as elaborate as what he told us. Wait for the video for the full version.) "Orchestrating python": why? He cares about reliability. You need a static application environment. Reliable deployments. Easy and reliable continuous integration. And self-healing. Nice is if it is also portable. A common way to make scalable systems is to use microservices. You compose, mix and extend them into bigger wholes. Ideally it is "cluster-first": also locally you test with a couple of instances. A "microservices architecture". Wouldn't it be nice to take the "blue pill" and move to a different reality? One in where you have small services, each running in a separate container without a care for what occurs around it? No sysadmin stuff? And similary the smart infrastructure people only have to deal with generic containers that can't break anything. He did a little demo with rethinkdb and flask. For the demo it uses coreOS: kernel + docker + etcd. CoreOS uses a read-only root filesystem and it by design doesn't have … -
Pygrunn: Leveraging procedural knowledge - K Rain Leander
(One of the summaries of the 2015 Pygrunn conference ) K Rain Leander works at Red Hat and yes, she wore a bright red hat :-) She's a python and django newbie. She knows how it is to be a newbie: there is so much in linux that there are always areas where you're a complete newbie. So everyone is helpful there. "Amsterdam is the capital of the netherlands" is declarative knowledge. Procedural knowledge is things like learning to ride a bike or a knew language. So: What versus How. You might know declaratively how to swim, but procedurally you might still drown: you need to practice and try. Some background: she was a dancer in the USA. Unless you're famous, you barely scrape by financially. So she started teaching herself new languages. Both real-life languages and computer languages. Css, html for starters. And she kept learning. She got a job at Red Hat. You have to pass a RHCE certification test within 90 days of starting work there - or you're fired. She made it. She She has military background. In bootcamp, the purpose is not the pushups and the long runs. The goal is to break you down … -
Pygrunn: IPython and MongoDB as big data scratchpads - Jens de Smit
(One of the summaries of the 2015 Pygrunn conference ) A show of hand: about half the people in the room have used mongodb and half used ipython notebooks. There's not a lot of overlap. Jens de Smit works for optiver, a financial company. A "high-frequency trader", so they use a lot of data and they do a lot of calculations. They do a lot of financial transactions and they need to monitor if they made the right trades. Trading is now almost exclusively done electronically. Waving hands and shouting on the trading floor at a stock exchange is mostly a thing of the past. Match-making between supply and demand is done centrally. It started 15 years ago. The volume of transactions really exploded. Interesting fact: the response time has gone from 300ms to just 1ms! So... being fast is important in electronic trading. If you're slow, you trade at the wrong prices. Trading at the wrong prices means losing money. So speed is important. Just as making the right choices. What he had to do is to figure out how fast an order was made and wether it was a good order. Non-intrusively. So: what market event did we …
