Introduction to django

My first presentation- On July 1, 2013 with Jasvir Singh at TCC, Guru Nanak Dev Engineering College.

Transcript

1. An introduction to... The Web framework for perfectionists with deadlines.
2. What is django? Django is a free, open source web application framework, written in Python, which follows the model–view– controller architectural pattern.
3. Features of django: • Clean URLs • Object- Relational Mapping • Loosely coupled components • Designer-friendly templates • Cache framework • MVC architecture • Jython support • DRY ( Don't Repeat Yourself)
4. Components: • URL dispatching: Regular expression based • Views • Models • Templates
5. URL dispatch provides a simple way to map URLs to view code using a simple pattern matching language. An ordered set of patterns is checked one-by-one. If one of the patterns matches the path information associated with a request, a particular view callable is invoked. URL dispatching:
6. Continue... If we type "www.example.com/poll/5/".... What code will be executed?
7. Continue... (r'^$', 'views.index'), (r'^hello/$', 'views.hello'), (r'^poll/(\d+)/$', 'views.poll'),
8. Models: • Generally, each model maps to a single database table. • Each attribute of the model represents a database field.
10. Views: A view is a Python function that takes a Web request and returns a Web response.
11. A simple view: def poll(request): s = "Hello, Polling World" return HttpResponse(s)
12. Templates: Templates are user interface of application, encouraging a clean separation of application and presentation logic. Templates can be maintained by anyone with an understanding of HTML; no knowledge of Python is required.
13. Templates: Quick Example {% if latest_poll_list %} <ul> {% for poll in latest_poll_list %} <li><a href="/admin/{{ poll.id }}/">{{ poll.question }}</a></li> {% endfor %} </ul> {% else %} <p>No polls are available.</p> {% endif %}
14. Alternatives of django: • Grok • Pylon • TurboGears • Web2py • Zope • Cheerpy
15. Why django? • Django keeps your website up and avoids unnecessary crashes. • Admin interfaces are easy. • Django builds large websites quickly. • It is fast as compared to other frameworks. • Emphasizes reusability.
17. Websites using django:
18. Jasvir Singh Grewal Kamaljeet Kaur jasvirsinghgrewal91.wordpress.com kamalkaur188.wordpress.com
19. Any queries?