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Django, What is it, Why is it cool?


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This text presentation attempts to hit on the highlight features and structure of Django and its ecco-system. It is intended as an introduction for those who are curious about , what is it?

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Django, What is it, Why is it cool?

  1. 1. Django, What is it, Why is it cool? 'Cause it is built on Python and has Pinax on top, and they are all Open Source
  2. 2. Why do I care? <ul><li>Open Source </li></ul><ul><li>Low cost </li></ul><ul><li>Platform Agnostic </li></ul><ul><li>No vendor lock in </li></ul><ul><li>High Performance </li></ul><ul><li>Modern architecture </li></ul><ul><li>Standards Compliant </li></ul><ul><li>Highly Modular </li></ul><ul><li>Widely supported </li></ul><ul><li>Internationalization support LtR language support </li></ul>
  3. 3. Django Is a Python Framework Not just a Web framework What is Python?
  4. 4. Traditional Approach vs. Django <ul><li>Build Data Dictionary </li></ul><ul><li>Build Data Base Interface </li></ul><ul><li>Build Authoring Tools </li></ul><ul><li>Build Logic </li></ul><ul><li>Paint Templates </li></ul><ul><li>Build Data Flow </li></ul>Done Done Done Done Done  Done Traditional Model                      Django
  5. 5. Python <ul><li>An Interpreted Language with extensive corporate usage and sponsorship  </li></ul><ul><li>Inherently Multiplatform Linux, Windows, Mac (some others) </li></ul><ul><li>Inherently Multi Language (multi character support also) </li></ul><ul><li>Many &quot;packages&quot; covering a wide variety of domains </li></ul><ul><li>Math : scipy  </li></ul><ul><li>Image Recognition </li></ul><ul><li>Corporate sponsorship: </li></ul><ul><li>Google </li></ul><ul><li>Microsoft (Iron Python) </li></ul><ul><li>Sun (Jython) </li></ul>
  6. 6. Django <ul><li>Lots of users: </li></ul><ul><li>Google </li></ul><ul><li>NASA </li></ul><ul><li>PBS </li></ul><ul><li>Bit-Bucket </li></ul><ul><li>Newspapers </li></ul>
  7. 7. Django as a framework <ul><li>  An MVC type framework (Called MVT in Django) </li></ul><ul><ul><li>M= Model, The database interface </li></ul></ul><ul><ul><li>V= View, Logic for getting stuff in and out of the database </li></ul></ul><ul><ul><li>T= Template, The display logic </li></ul></ul><ul><li>Closest competitor is Ruby on Rails Microsoft playing catch up in MVC frameworks still almost Beta Java examples are Grails, Spring, Struts or Java Server Faces PHP has dozens Symfony, CodeIgniter </li></ul><ul><li>  </li></ul><ul><li>For the Web MVT (or MVC) is as important a concept as &quot;Structured Programming&quot; and dates back to 1979. </li></ul><ul><li>  </li></ul><ul><li>Enables easier maintenance and independent development of functional modules with different skill sets </li></ul>
  8. 8. Django layers (MVT) <ul><li>Model ..View...Template </li></ul><ul><li>Model </li></ul><ul><ul><li>Database interface an abstraction </li></ul></ul><ul><ul><li>Supports: </li></ul></ul><ul><ul><ul><ul><li>Mysql </li></ul></ul></ul></ul><ul><ul><ul><ul><li>MSsql </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Oracle </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Postgre Sql </li></ul></ul></ul></ul><ul><ul><ul><ul><li>IBM Db2 </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Sql lite </li></ul></ul></ul></ul><ul><ul><li>In general: change the DataBase and don't touch your code </li></ul></ul><ul><li>Define model, Admin gets generated automatically </li></ul><ul><li>So does the database </li></ul><ul><li>Most data editing </li></ul>
  9. 9. Django View <ul><li>Most Business logic </li></ul><ul><li>edits, calculations </li></ul><ul><li>permissions </li></ul><ul><li>many libraries available </li></ul><ul><li>Context processors: </li></ul><ul><li>More advanced business logic </li></ul>
  10. 10. Template <ul><li>Simple template language </li></ul><ul><li>Css is separate </li></ul><ul><li>designed for non technical users such as designers </li></ul><ul><li>Easily able to use other Template models (Jinga) </li></ul><ul><li>Can be used with most advanced front end tools: </li></ul><ul><ul><li>Ajax </li></ul></ul><ul><ul><li>Jquery </li></ul></ul><ul><ul><li>Pyjamas (an upcoming Python Web Presentation tool) </li></ul></ul><ul><ul><li>Flash </li></ul></ul><ul><ul><li>Adobe Air </li></ul></ul>
  11. 11. Other Django features <ul><li>Unique in being built on standard language and able to take advantage of libraries developed for other purposes, Imaging, graphics, scientific calculations and many more. </li></ul><ul><li>Extensive configuration file </li></ul><ul><ul><li>Different Databases </li></ul></ul><ul><ul><li>Different sites </li></ul></ul><ul><ul><li>Different operating systems </li></ul></ul><ul><ul><li>Different Caching frameworks </li></ul></ul><ul><li>Structure allows site optimization across specialized servers </li></ul><ul><ul><li>Static media </li></ul></ul><ul><ul><li>Media </li></ul></ul><ul><li>And now also Pinax which is a  collection of pre-configured applications written in Django </li></ul>
  12. 12. Other Django features continued <ul><li>Loosely coupled </li></ul><ul><li>Alternative Model layer, Sql Alchemy </li></ul><ul><li>Alternative Template layer, Jinga, Jinga2 </li></ul><ul><li>Many users constantly adding modules and features </li></ul>
  13. 13. Pinax <ul><li>Pre-assembled Django Applications </li></ul><ul><li>Permissions </li></ul><ul><li>Blog </li></ul><ul><li>Social site </li></ul><ul><li>Project site </li></ul><ul><li>Sales site </li></ul>
  14. 14. Tools <ul><li>Python </li></ul><ul><li>Python Debug tools </li></ul><ul><li>Django debug toolbar </li></ul><ul><li>Eclipse Pydev </li></ul><ul><li>Pylint </li></ul><ul><li>Pytest Doc test Unit test </li></ul><ul><li>Embedded documentation via Sphinx </li></ul><ul><li>Change control done with Distributed change control tool GIT (used by the Linux development team) </li></ul>