Django –Marathon 4/6

Topic Covered: URL and Routing

What is the need of routing  ?

• - To make URL easy and better for SEO
• - To not show user specific files like .html and .py as request
• - To show details as per user request or action

Django uses Regular expressions for patterns (called perl regular expression)

• $Contact  —must start with contact ie contactus
• Us^ — end with us ie contactus
• \d – for digits
• \D – Non digit
• \w – Word character or alphanumeric  (A-Z,0-9,_)
• \W – non word character

To Create you own range use square bracket

- [a-z] lower case a to z

- [az] specifically a or z

- [a-zA-Z ] means lower case a through Z  and upper A through Z ie all Letters of alphabets

For Specific Choices ,Few Examples  [Look more  ] // Regular Expressions

• -\d   For a single Digit
• -\d\d od \d{2} for two digits , brackets applies to item immediately proceeding it  (asd\d){2}
• -\d{1,2} means minimum and maximum number of items
• • \d+ : + means Zero or more
• -\d* : * means zero or more
• -\d? ? means item is optional

Reference For Lookup:

- https://regexlib.com/?AspxAutoDetectCookieSupport=1

- https://www.diveintopython3.net/regular-expressions.html

Django Chooses the First pattern that matches

Example  :

//in Url.py

url(r’^artists$’,app.views.artists,name=’home’),

url(r’^artists/(?P[A-Za-z]+)$’,app.views.artistdetails,name=’artistdetails’),

//in views.py

from django.http import HttpRequest,HttpResponse

def artists(request):

return HttpResponse(‘Hello, Django!

Helllo World

’);

def artistdetails(request,name):

output=’‘+name

output+=’

’+ name

output+=’’

return HttpResponse(output);

Start Server for output to see instantenous changes

## !! Correction ..^ to Start $ to end