Python socket – network programming tutorial. Network programming in python This is a quick guide/tutorial on socket programming in python. Socket programming python is very similar to C. To summarise the basics, sockets are the fundamental "things" behind any kind of network communications done by your computer. For example when you type www.google.com in your web browser, it opens a socket and connects to google.com to fetch the page and show it to you. In this tutorial we shall be programming tcp sockets in python. Before you begin This tutorial assumes that you already have a basic knowledge of python. So lets begin with sockets. Creating a socket This first thing to do is create a socket. Function socket.socket creates a socket and returns a socket descriptor which can be used in other socket related functions The above code will create a socket with the following properties ...
Address Family : AF_INET (this is IP version 4 or IPv4) Type : SOCK_STREAM (this means connection oriented TCP protocol) Error handling Note Connect to a Server. Advanced Regular Expression Tips and Techniques. Regular Expressions are the Swiss Army knife for searching through information for certain patterns. They have a wide arsenal of tools, some of which often go undiscovered or underutilized. Today I will show you some advanced tips for working with regular expressions. Adding Comments Sometimes, regular expressions can become complex and unreadable. For example, here is something we might use to check for US phone numbers. It can become much more readable with comments and some extra spacing. Let’s put it within a code segment. Output Without White spaces Regular expressions are a great feature of python, but debugging them can be a pain, and it’s all too easy to get a regex wrong. Fortunately, python can print the regex parse tree by this flag re.DEBUG (actually, 128) to re.compile or re.match.
Parse Tree Greedy vs. Before I start explaining this concept, I would like to show an example first. The result will be as expected: Let’s change the input and add a second anchor tag: By adding ‘? Other. Python and Real-time Web | Eat at Joe's. Introduction I had interview for the Flask book recently and some questions were related to realtime functionality - how it works, how to integrate realtime portion with conventional WSGI applications, how to structure application code and so on.
We used Google Hangouts and it was supposed to record interview, but it failed. So, I decided to write elaborate blog post instead, in which I will try to cover basics, give short introduction into asynchronous programming in Python, etc. Little Bit of Theory Lets try to solve server "push" problem. Solution is simple: browser makes AJAX request to the server and asks for updates. This technique is called long-polling. Obviously, this is not very efficient approach.
But, unfortunately, it is most compatible way to push data to the client right now. HTTP/1.1 improved situation a bit. HTTP/1.1 also introduced chunked transfer encoding. In September 2006, Opera Software implemented experimental Server-Sent Events feature for its browser. Use Cases Games. Ironpython - What "kind" of Python to start with. Python - Greenlet Vs. Threads.
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. Не сильно заботясь о воспроизведении функционала существующих аналогов, я писал код так, как казалось правильным мне самому. В итоге сообщения клиентам доставлялись, всё работало, но! 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. Возникает вопрос. Спасибо за внимание! 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. Blist. 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. This release supports Python 1.5.2 and newer, including 2.5 and 2.6. A version for 3.X will be released later. 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.
Pillow. Python.org. Python People. Django People.
UI. Database. Libs. 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. While many of them may be manipulated directly, it’s often best to use context_managers, either generally via settings or via specific context managers such as cd.
Note that many of these may be set via fab‘s command-line switches – see fab options and arguments for details. Cross-references are provided where appropriate. abort_exception Default: None Fabric normally handles aborting by printing an error message to stderr and calling sys.exit(1). Abort_on_prompts Default: False all_hosts Default: [] Default: True. PyPy :: PyPy. 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. Cwiid. PySerial.
Python Programming Language – Official Website.