How to Build a RESTful API in Python with Flask

When software and applications are being developed, it is sometimes important that the teams are able to share their work and publicize it as a service.

Sometimes, even within the same software, there could be components that require integration with another internal module.

For instance, if our software is a ticketing system, there could be a calculation module that might calculate the final cost including the taxes and vats. This can be easily made possible with the APIs.

The ability to build and maintain an API is important. This article will teach you how to build a RESTful API in Python using the Flask framework.

Table of Contents

You can skip to a specific section of this Python API tutorial using the table of contents below:

  • What are APIs?
  • What is Flask?
  • Creating a Basic Flask Application
  • A Flask Application with Multiple Functionalities
    • 1. Variable Path
    • 2. Returning JSON Responses
  • Final Thoughts

What are APIs?

API is one of the most heard terms in the field of software engineering. Even most of the non-technical users of the internet are somewhat familiar with this term API. It stands for application programming interface. APIs can be identified as a software intermediary that acts as an interface for applications to communicate with each other, accept external requests, and respond appropriately abiding by the set of rules that have been specified by the developers.

APIs usually are independent entities that offer functionalities to the external world without having to publicize how its internals work. Therefore, APIs really support the concept of building software as blocks of codes. Moreover, this helps developers to start writing software not from the scratch but rather as pre-built reusable components. Not only does this speed up the software development process but also helps teams to collaborate and even offer their APIs as a service to other teams and organizations.

Usually, when we are talking about APIs, we are naturally referring to REST APIs. REST APIs are programming interfaces with a specific set of predefined rules and these interfaces can be accessed via HTTP adhering to these set of rules. There are also methods supported by the developers of the API allowing the external parties to interact with it. These methods are as follows.

  1. GET - These types of requests cater to the functionality of requesting data from a remote server and retrieving it at the client’s side.
  2. POST - These types of requests are associated with sending data to the remote server.
  3. PUT - These requests are also used to send and modify data in a remote server.
  4. DELETE - These requests are used to delete any persisting data in a remote database.

As an example, let’s take a look at how we send a GET request and retrieve data from a remote server.

import requests
import json
response = requests.get("http://api.open-notify.org/iss-now.json")
print(json.loads(response.text) )

In this, we are requesting the current position of the International Space Station using the open API provided by Open Notify. If we look at the code, we are importing the requests library and using the requests.get() method to retrieve a response. Then we are printing it using the json.loads() method and the text attribute of the response we received.

Output:

{'message': 'success', 'iss_position': {'latitude': '41.9740', 'longitude': '150.8389'}, 'timestamp': 1600591768}

This is how we can interact with an API as the client. In this tutorial, we will be developing the server-side application to cater to the needs of clients who are requesting our service. We will be using Flask for that and let’s now take a look at what it is and what we can do with it.

#python #flask #api #web-development #programming

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How to Build a RESTful API in Python with Flask
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What is REST API? An Overview | Liquid Web

What is REST?

The REST acronym is defined as a “REpresentational State Transfer” and is designed to take advantage of existing HTTP protocols when used for Web APIs. It is very flexible in that it is not tied to resources or methods and has the ability to handle different calls and data formats. Because REST API is not constrained to an XML format like SOAP, it can return multiple other formats depending on what is needed. If a service adheres to this style, it is considered a “RESTful” application. REST allows components to access and manage functions within another application.

REST was initially defined in a dissertation by Roy Fielding’s twenty years ago. He proposed these standards as an alternative to SOAP (The Simple Object Access Protocol is a simple standard for accessing objects and exchanging structured messages within a distributed computing environment). REST (or RESTful) defines the general rules used to regulate the interactions between web apps utilizing the HTTP protocol for CRUD (create, retrieve, update, delete) operations.

What is an API?

An API (or Application Programming Interface) provides a method of interaction between two systems.

What is a RESTful API?

A RESTful API (or application program interface) uses HTTP requests to GET, PUT, POST, and DELETE data following the REST standards. This allows two pieces of software to communicate with each other. In essence, REST API is a set of remote calls using standard methods to return data in a specific format.

The systems that interact in this manner can be very different. Each app may use a unique programming language, operating system, database, etc. So, how do we create a system that can easily communicate and understand other apps?? This is where the Rest API is used as an interaction system.

When using a RESTful API, we should determine in advance what resources we want to expose to the outside world. Typically, the RESTful API service is implemented, keeping the following ideas in mind:

  • Format: There should be no restrictions on the data exchange format
  • Implementation: REST is based entirely on HTTP
  • Service Definition: Because REST is very flexible, API can be modified to ensure the application understands the request/response format.
  • The RESTful API focuses on resources and how efficiently you perform operations with it using HTTP.

The features of the REST API design style state:

  • Each entity must have a unique identifier.
  • Standard methods should be used to read and modify data.
  • It should provide support for different types of resources.
  • The interactions should be stateless.

For REST to fit this model, we must adhere to the following rules:

  • Client-Server Architecture: The interface is separate from the server-side data repository. This affords flexibility and the development of components independently of each other.
  • Detachment: The client connections are not stored on the server between requests.
  • Cacheability: It must be explicitly stated whether the client can store responses.
  • Multi-level: The API should work whether it interacts directly with a server or through an additional layer, like a load balancer.

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An API-First Approach For Designing Restful APIs | Hacker Noon

I’ve been working with Restful APIs for some time now and one thing that I love to do is to talk about APIs.

So, today I will show you how to build an API using the API-First approach and Design First with OpenAPI Specification.

First thing first, if you don’t know what’s an API-First approach means, it would be nice you stop reading this and check the blog post that I wrote to the Farfetchs blog where I explain everything that you need to know to start an API using API-First.

Preparing the ground

Before you get your hands dirty, let’s prepare the ground and understand the use case that will be developed.

Tools

If you desire to reproduce the examples that will be shown here, you will need some of those items below.

  • NodeJS
  • OpenAPI Specification
  • Text Editor (I’ll use VSCode)
  • Command Line

Use Case

To keep easy to understand, let’s use the Todo List App, it is a very common concept beyond the software development community.

#api #rest-api #openai #api-first-development #api-design #apis #restful-apis #restful-api

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Opencart REST API 
OCRESTAPI Module allows the customer purchasing product from the website it just like E-commerce APIs its also available mobile version APIs.

Opencart Rest APIs List 
Customer Registration GET APIs.
Customer Registration POST APIs.
Customer Login GET APIs.
Customer Login POST APIs.
Checkout Confirm GET APIs.
Checkout Confirm POST APIs.


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Creating REST API with Python and Flask: Web development with Python and flask part 6

Creating REST API with Python and Flask: Web development with Python and flask part 6

Leave a Comment / FlaskPythonWeb Developemnt / By winston23 / May 7, 2021 / APIflaskREST API

Views: 265

An API, which stands for Application Programming Interface, is just what its name suggests it is. It’s an Interface for other application programs. Meaning it helps connect different programs and machines to access and share data. An interface is just a medium facilitating the access of certain functionality or an intermediary between two systems. In the post about REST here, we gave an example of connecting to a Facebook graph API to access Facebook user information to log in a user to a third-party application.

Get the code for this blog post from my github repository

REST ,an acronym for Representational State Transfer, is just a style guide for creating these APIs.We have a complete and indepth post here discussing what REST is, read it to have a clear understanding about that topic(REST) before continuing.

In this tutorial we will be looking at how we can create our own REST API in Python using flask micro-framework.

Table of Content

  • A brief introduction to flask and its installation
  • Why flask?
  • Creating and connecting to sqlite3 database
  • Creating our API endpoints
  • Creating the **CRUD **operations functionality for our API
  • Testing our endpoint with postman
  • Conclusion

#flask #python #web developemnt #api #flask #rest api