Python api development examples

Python api development examples

Here are some Python API development examples:

Example 1: Simple RESTful API with Flask

Let's create a simple RESTful API using Flask to store and retrieve user data. We'll use the flask_restful library to handle requests and responses.

from flask import Flask, request
from flask_restful import Resource, Api
app = Flask(name)
api = Api(app)
class User(Resource):
def get(self, id):
Return a user by ID
return {'user': f'ID: {id}'}
def post(self):
Create a new user
data = request.get_json()
return {'user': 'Created successfully'}
class Users(Resource):
def get(self):
Return all users
return [{'user': 'User 1'}, {'user': 'User 2'}]
api.add_resource(User, '/users/int:uid')
api.add_resource(Users, '/users')
if name == 'main':
app.run(debug=True)

Example 2: Building a Chatbot with Rasa

Let's build a simple chatbot using Rasa to handle user input and respond accordingly.

from rasa.nlu import entities
Define intents and responses
intents = {'greeting': 'Hello, I'm your assistant. What can I help you with?'}
responses = ['Sorry, I didn't quite catch that. Can you try again?']
Define a domain
domain = {'entities': ['time']}
Create an NLU component
nlu = entities.EntityExtractor()
Train the NLU model
nlu.train(intents)
Run the chatbot
rasa.run('chatbot', 'localhost', 5005)

Example 3: Building a Microservice with Django

Let's build a simple microservice using Django to handle user requests and process data.

from django.http import HttpResponse
def index(request):
Return a welcome message
return HttpResponse('Welcome to our API!')
def process_data(request):
Process user input
data = request.GET.get('data')
Return processed data
return HttpResponse(f'Processed data: {data}')

Example 4: Building a GraphQL API with Django

Let's build a simple GraphQL API using Django to handle user queries and mutations.

from django_filters.rest_framework import FilterSet
from graphene import ObjectType, String
class Book(ObjectType):
title = String()
Define a query type
class Query(ObjectType):
book = String()
def resolve_book(self, info, **kwargs):
Return a book by ID
return {'title': 'To Kill a Mockingbird'}
class Mutation(ObjectType):
create_book = String()
def mutate(self, info, **kwargs):
Create a new book
return {'message': 'Book created successfully'}
Run the GraphQL API
graphql_api = Query().as_graphql(schema)

These are just a few examples of Python API development. There are many more libraries and frameworks available to help you build scalable and robust APIs.

Additional Resources

I hope these examples and resources help you get started with building your own Python APIs!

How to create API in Python Django

To create an API in Python using the Django framework, you'll need to follow these steps:

django-admin startproject api_project
cd api_project/
python manage.py startapp api_app

from rest_framework.response import Response
from rest_framework.views import APIView
class MyAPI(APIView):
def get(self, request):
return some data in JSON format
data = {'message': 'Hello, World!'}
return Response(data)
def post(self, request):
handle POST requests
pass

from rest_framework import serializers
class MySerializer(serializers.Serializer):
message = serializers.CharField()
def create(self, validated_data):
do something with the data
pass
def update(self, instance, validated_data):
do something with the data
pass

from django.urls import path
from .views import MyAPI
urlpatterns = [
path('my_api/', MyAPI.as_view()),
]

from django.urls import path, include
urlpatterns = [
...
path('api/', include('api_app.urls')),
]

python manage.py makemigrations
python manage.py migrate

python manage.py runserver

curl http://localhost:8000/api/my_api/

That's a basic overview of how to create an API in Python using Django!