Python Django REST API - Part 1

Step 1: Download Python using the below Url

Step 2: To Install django using command prompt

pip install django

Step 3: To Install django rest framework using command prompt

pip install djangorestframework

Step 4:To create default project template

django-admin startproject <ProjectName>

Step 5:Navigate into <ProjectName> folder. ex: cd ProjectName

Step 6:To create API project template

python manage.py startapp <ApiProjectName>

Step 7:Open settings.py file under "INSTALLED_APPS" add the below code "rest_framework" and ApiProjectName.

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'rest_framework',
    'ApiProjectName',
]

Step 8:Open view.py file inside ApiProjectName folder add the below lines.

from django.http import Http404
from rest_framework.views import APIView
from rest_framework.decorators import api_view
from rest_framework.response import Response
from rest_framework import status
from django.http import JsonResponse
from django.core import serializers
from django.conf import settings
import json

@api_view(["POST"])
def SquareNumber(requestNumber):
    try:
        value=json.loads(requestNumber.body)
        result=str(value*value)

        return JsonResponse("Square of "+str(value)+" is "+result,safe=False)
    except ValueError as e:
        return Response(e.args[0],status.HTTP_400_BAD_REQUEST)

Step 9: Open urls.py file add below code

from django.conf.urls import url
from django.contrib import admin
from ApiProjectName import views

urlpatterns = [
    url('admin/', admin.site.urls),
    url('square/',views.SquareNumber),
]

 Step 10: To run to application, use the below command in command prompt.

python manage.py runserver

Step 11: Open postman and create request as POST and url as http://127.0.0.1:8000/square and click body tab and choose Raw and JSON as type and in body content as some value ex: 10. and click and send button.