The environment dictionary A simple but integral aspect of Fabric is what is known as the “environment”: a Python dictionary subclass, which is used as a combination settings registry and shared inter-task data namespace. The environment dict is currently implemented as a global singleton, fabric.state.env, and is included in fabric.api for convenience. Keys in env are sometimes referred to as “env variables”. Below is a list of all predefined (or defined by Fabric itself during execution) environment variables. Note that many of these may be set via fab‘s command-line switches – see fab options and arguments for details. abort_exception Default: None Fabric normally handles aborting by printing an error message to stderr and calling sys.exit(1). Give it a callable which takes a string (the error message that would have been printed) and returns an exception instance. abort_on_prompts Default: False all_hosts Default: [] Set by fab to the full host list for the currently executing command. always_use_pty Default: True cwd
Repository Structure and Python This opinionated guide was written for my best-practices guide, The Hitchhiker’s Guide to Python. It is based on the recommendations of the Distribute project, personal experience, and good intentions. It’s Important. Just as Code Style, API Design, and Automation are essential for a healthy development cycle, Repository structure is a crucial part of your project’s architecture. When a potential user or contributor lands on your repository’s page, they see a few things: Project NameProject DescriptionBunch O’ Files Only when they scroll below the fold will the user see your project’s README. If your repo is a massive dump of files or a nested mess of directories, they might look elsewhere before even reading your beautiful documentation. Dress for the job you want, not the job you have. Of course, first impressions aren’t everything. Sample Repository tl;dr: This is what I recommend. This repository is available on GitHub. Let’s get into some specifics. The Actual Module Location . . . License . How?
Django People Django at a glance Because Django was developed in a fast-paced newsroom environment, it was designed to make common Web-development tasks fast and easy. Here’s an informal overview of how to write a database-driven Web app with Django. The goal of this document is to give you enough technical specifics to understand how Django works, but this isn’t intended to be a tutorial or reference – but we’ve got both! Design your model Although you can use Django without a database, it comes with an object-relational mapper in which you describe your database layout in Python code. The data-model syntax offers many rich ways of representing your models – so far, it’s been solving two years’ worth of database-schema problems. Install it Next, run the Django command-line utility to create the database tables automatically: The syncdb command looks at all your available models and creates tables in your database for whichever tables don’t already exist. Enjoy the free API Design your URLs Write your views Having trouble?
PIL The Python Imaging Library (PIL) adds image processing capabilities to your Python interpreter. This library supports many file formats, and provides powerful image processing and graphics capabilities. Status The current free version is PIL 1.1.7. Support Free Support: If you don't have a support contract, please send your question to the Python Image SIG mailing list. You can join the Image SIG via python.org's subscription page, or by sending a mail to image-sig-request@python.org. You can also ask on the Python mailing list, python-list@python.org, or the newsgroup comp.lang.python. Downloads The following downloads are currently available: Additional downloads may be found here. For a full list of changes in this release, see this page. If the Windows installer cannot find a Python interpreter, you may have to register your interpreter. For a full list of changes in this release, see this page.
How to Get Started with PAnt Follow these steps to to get started with PAnt: Download Jython. Note that as of right now Jython 2.5 is somewhat slower to initialize than 2.2. You only need 2.5 if you want to be able to use decorators to create Ant targets. Unzip jython distribution. Note: you need jython.jar and all files under Lib. Download PAnt. Now the prep work is done and you can begin developing your build logic in python. That's it, the rest of it is simply writing your build logic in python using Ant tasks as documented here. pybluez PyBluez is an effort to create python wrappers around system Bluetooth resources to allow Python developers to easily and quickly create Bluetooth applications. PyBluez works on GNU/Linux and Windows XP (Microsoft and Widcomm Bluetooth stacks). It is freely available under the GNU General Public License. Documentation See the Documentation page. Mailing List / Contact Please use the mailing list at News Jan 19, 2014 Version 0.20 released. Oct 15, 2009 Version 0.17 released. Feb 5, 2009 Version 0.16 released. Jan 21, 2008 Version 0.15 released. Jan 3, 2008 We are slowly transitioning the website from MIT (org.csail.mit.edu/pybluez) to Google Code ( Nov 12, 2007 Version 0.14 released. Aug 30, 2007 Version 0.13 released. Aug 29, 2007 Version 0.12 released. Aug 25, 2007 Version 0.11 released. Aug 15, 2007 Version 0.10 released. added experimental Broadcom/Widcomm support. Widcomm stack notes: 1. Dec 27, 2006 Version 0.9.2 released.
Python Multithreaded Programming Running several threads is similar to running several different programs concurrently, but with the following benefits − Multiple threads within a process share the same data space with the main thread and can therefore share information or communicate with each other more easily than if they were separate processes.Threads sometimes called light-weight processes and they do not require much memory overhead; they care cheaper than processes. A thread has a beginning, an execution sequence, and a conclusion. It can be pre-empted (interrupted)It can temporarily be put on hold (also known as sleeping) while other threads are running - this is called yielding. Starting a New Thread To spawn another thread, you need to call following method available in thread module: thread.start_new_thread ( function, args[, kwargs] ) This method call enables a fast and efficient way to create new threads in both Linux and Windows. Example #! When the above code is executed, it produces the following result − #! #!
blist Django REST framework - APIs made easy Installing Django on an Ubuntu Linux Server Today I had the task of installing a development server running the Django Python framework for one of our web developers. I learned a few things and I figured a quick tutorial might help someone else out. None of this covers new ground, but perhaps another telling of the story will help someone out there. I started from scratch, with a basic install of Ubuntu 7.04 Server Edition. I did not choose any extra packages, such as the LAMP option or DNS server. Install server software Install Apache, Mod_Python, MySQL and MySQLdb. sudo apt-get install apache2 libapache2-mod-python sudo apt-get install mysql-server python-mysqldb Install the Django source code At this point you have a couple of options. cd ~/ svn co django_src Python won’t recognize Django unless it is installed in the “site-packages” directory, so instead we just create a symbolic link to the source code in our home directory. Create Django’s directories Create a Django project
Centrifuge набирает обороты Привет! Пару месяцев назад я опубликовал на Хабре статью, посвященную описанию open-source проекта Centrifuge. Напомню, что это сервер рассылки сообщений подключенным клиентам (в основном из веб-браузера) в реальном времени. Написан на Python. С тех пор я продолжал работать над проектом в свободное время и сейчас готов поделиться накопившимися мыслями и изменениями. Изначально, Центрифуга была самобытным проектом. В конце июня я наткнулся на великолепную статью от Serge Koval — Python and real-time Web. С того времени я допиливал Центрифугу с прицелом на удобство использования и с оглядкой на pusher.com, pubnub.com и Faye. Вопрос, зачем мне нужно было писать код с нуля, если уже существуют более матерые и продвинутые аналоги, неизбежен. Это интересно. Теперь расскажу об изменениях, произошедших с момента написания предыдущей статьи о Центрифуге. Можно пойти чуть дальше — и запустить Центрифугу со структурой, описанной в конфигурационном файле. Возникает вопрос. Спасибо за внимание!