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Chapter-1Introduction
To
Web Development
And
Django
1 NARESH IT, 2nd Floor, Durga Bhavani Complex, Satyam Threater Rd, Ameerpet, HYD
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,Web Application:
The applications which will provide services over the web are called web applications.
Eg: gmail.com, facebook.com, durgasoftvideos.com etc
Every web application contains 2 main components
1) Front-End
2) Back-End
1) Front-End:
It represents what user is seeing on the website
We can develop Front-End content by using the following technologies:
HTML, JS, CSS, JQuery and BootStrap
JQuery and Bootstrap are advanced front-end technologies, which are developed by
using HTML, CSS and JavaScript only.
HTML:
HyperText Markup Language
Every web application should contain HTML. i.e HTML is the mandatory technology for
web development.It represents structure of web page
CSS: Cascading Style Sheets
It is optional technology, still every web application contains CSS.
The main objective of CSS is to add styles to the HTML Pages like colors, fonts, borders
etc.
Java Script:
It allows to add interactivity to the web application including programming logic.
The main objective of Java Script is to add functionality to the HTML Pages. ie to add
dynamic nature to the HTML Pages.
HTML Meant for Static Responses
HTML+JS Meant for Dynamic Responses
Eg 1: To display "Welcome to Mahesh IT " response to the end user only HTML is
enough,b'z it is static response.
Eg 2: To display current server date and time to the end user, only HTML is not enough
we required to use some extra technology like JavaScript,JSP,ASP,PHP etc as it is
dynamic response.
2 NARESH IT, 2nd Floor, Durga Bhavani Complex, Satyam Threater Rd, Ameerpet, HYD
Telangana-500016 | Tel:+91 40 2374 6666 | Ph:+91 90009 94007 | www.nareshit.in
,Static Response vs Dynamic Response:
If the response is not varied from time to time and person to person then it is considered
as static response.
Eg: Login Page of Gmail
Home Page of ICICI Bank
If the response is varied from time to time and person to person then it is considered as
dynamic response.
Eg: Inbox Page of Gmail
Balance Page of ICICI Bank
2) Back End:
It is the technology used to decide what to show to the end user on the Front-End.
ie Backend is responsible to generate required response to the end user,which is
displayed by the Front-End.
Back-End has 3 important components:
1) The Language like Java,Python etc
2) The Framework like DJango,Pyramid,Flask etc
3) The Database like SQLite,Oralce,MySQL etc
For the Backend language Python is the best choice b'z of the following reasons:
Simple and easy to learn, libraries and concise code.
For the Framework DJango is the best choice b'z it is Fast, Secure and Scalable. Django
is the most popular web application framework for Python.
DJango provides inbuilt database which is nothing but SQLite, which is the best choice
for database.
The following are various popular web applications which are developed by using
Python and DJango
YouTube, Dropbox, Quora, Instagram, Reddit, Yahoo Maps etc
DJango:
⚽ Django is a free and open-source web framework.
⚽ It is written in Python.
⚽ It follows the Model-View-Template (MVT) architectural pattern.
⚽ It is maintained by the Django Software Foundation (DSF)
3 NARESH IT, 2nd Floor, Durga Bhavani Complex, Satyam Threater Rd, Ameerpet, HYD
Telangana-500016 | Tel:+91 40 2374 6666 | Ph:+91 90009 94007 | www.nareshit.in
, ⚽ It is used by several top websites like Youtube,Google,Dropbox,Yahoo Maps,
Mozilla,Instagram,Washington Times,Nasa and many more
⚽ https://www.shuup.com/blog/25-of-the-most-popular-python-and-django-websites/
⚽ Django was created in 2003 as an internal project at Lowrence Journal-World News
Paper for their web development.
⚽ The Original authors of Django Framework are: Adrian Holovaty, Simon Willison
⚽ After Testing this framework with heavy traffics, Developers released for the public as
open source framework on July 21st 2005.
⚽ The Django was named in the memory of Guitarist Django Reinhardt.
⚽ Official website: djangoproject.com
Top 5 Features of Django Framework:
Django was invented to meet fast-moving newsroom deadlines, while satisfying the tough
requirements of experienced Web developers.
The following are main important features of Django
1) Fast:
Django was designed to help developers take applications from concept to completion
as quickly as possible.
2) Fully loaded:
Django includes dozens of extras we can use to handle common Web development
tasks. Django takes care of user authentication, content administration, site maps, RSS
feeds, and many more tasks.
3) Security:
Django takes security seriously and helps developers avoid many common security
mistakes, such as SQL injection, cross-site scripting, cross-site request forgery and
clickjacking. Its user authentication system provides a secure way to manage user
accounts and passwords.
4 NARESH IT, 2nd Floor, Durga Bhavani Complex, Satyam Threater Rd, Ameerpet, HYD
Telangana-500016 | Tel:+91 40 2374 6666 | Ph:+91 90009 94007 | www.nareshit.in
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