Python Tutorial

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Python Conditional Statements

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Python Loops

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Python Arrays

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Python Built-in Data Structure

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Python Functions

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Python File Handling

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Python Exception Handling

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Python OOPs Concept

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Python Iterators

Iterators in Python Yield Statement In Python

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Python Functions and Methods

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Python Modules

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Python MySQL

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Python MongoDB

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Python Advance Topics

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Python 3

Anaconda in Python 3 Anaconda python 3 installation for windows 10 List Comprehension in Python3

Misc

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How to

How to Substring a String in Python How to Iterate through a Dictionary in Python How to convert integer to float in Python How to reverse a string in Python How to take input in Python How to install Python in Windows How to install Python in Ubuntu How to install PIP in Python How to call a function in Python How to download Python How to comment multiple lines in Python How to create a file in Python How to create a list in Python How to declare array in Python How to clear screen in Python How to convert string to list in Python How to take multiple inputs in Python How to write a program in Python How to compare two strings in Python How to create a dictionary in Python How to create an array in Python How to update Python How to compare two lists in Python How to concatenate two strings in Python How to print pattern in Python How to check data type in python How to slice a list in python How to implement classifiers in Python How To Print Colored Text in Python How to develop a game in python How to print in same line in python How to create a class in python How to find square root in python How to import numy in python How to import pandas in python How to uninstall python How to upgrade PIP in python How to append a string in python How to open a file in python How to Open a file in python with Path How to run a Python file in CMD How to change the names of Columns in Python How to Concat two Dataframes in Python How to Iterate a List in Python How to learn python Online How to Make an App with Python

Sorting

Python Sort List Sort Dictionary in Python Python sort() function Python Bubble Sort

Programs

Factorial Program in Python Prime Number Program in Python Fibonacci Series Program in Python Leap Year Program in Python Palindrome Program in Python Check Palindrome In Python Calculator Program in Python Armstrong Number Program in Python Python Program to add two numbers Anagram Program in Python Even Odd Program in Python GCD Program in Python Python Exit Program Python Program to check Leap Year Operator Overloading in Python Pointers in Python Python Not Equal Operator Raise Exception in Python Salary of Python Developers in India What is a Script in Python

Python Rest API

In this tutorial, we will understand the meaning of API and REST API. We will understand the working of REST API. We will then realize the boundaries of architecture defined by REST. Further, we will understand different methods for CRUD operation.

API

It is a set of guidelines that allows programs to interact with each other. API is created by developers on a server and permits the client to interrelate with it.

Rest API

The Representational State Transfer is the expanded name of REST. It takes HTTP requests into account for communication with web services. It uses numerous values such as HTTP, JSON, URL, and XML for data communication and transfer. It is a set of protocols that developers keep in mind while dealing with the creation of API.

Working

A client sends a request in the form of a web URL in the form of HTTP GET or HTTP POST or HTTP PUT or HTTP DELETE request. Further, an answer is received from the server in the form of resources which may be either HTML, XML, Image, or JSON.  JSON is the most commonly used resource among all.

Boundaries on Architecture as defined by the REST:

  • Client-server Architecture: The Client and Server architecture is necessary for a REST application. The client is responsible for requesting resources and the server is responsible for storing the resources. Neither of them depends on each other for anything. They function independently.
  • Cacheable: It is important for every response to include whether the reply is cacheable or not and the time for which the response can be cacheable on the client-side. The client will direct the data from its cache for any following request without the need of sending the data again to the server.  
  • Standard Interface: This interface enables the client to interact with the server in a single language that is consistent and standardized irrespective of the architectural assistance.
  • Stateless: It is the request which is capable of storing the important states to handle the requests. While the server stores nothing as such.
  • Layered System: An application architecture comprises several layers. Each layer is independent of the others but the intermediate layer. The intermediate layer plays a key role in improving the readiness of the system.
  • Code on Demand: It is a discretionary feature. Here, the server is responsible for providing executable code to the client.

Method

There is five CRUD (Create, Read, Update and Delete) methods popularly used in REST based architecture:

GET: The GET method is employed to read or retrieve an illustration of a resource. It returns an illustration in the format XML or JSON.

POST : The POST verb is most often employed to create new resources. To be precise, It is used to create subsidiary resources.

NOTE: It is easy for the users to use GET and POST methods without the need to install any methods override.

PUT: It is employed to update the aptitudes. It is preferred when the user chooses to update or replace all the existing resources in a go.  Though, PUT can also be used to create a resource in the case where the resource ID is chosen by the client instead of by the server.

DELETE: It is employed to delete a resource identified by a URI. The unique key of the object is passed to delete a key.

NOTE: To use PUT and DELETE methods, the user needs to install methods override which can be done in the following way.

npm install method-override –save

The following package needs to be installed before being able to use the above.

var methodOverride = require("method-override");

PATCH: It is mainly used to update a request on the server just like PUT. But the difference is it can be employed to delete patches or part of data and not the whole data in a go. The PATCH request only requires to comprise the changes to the resource, not the complete resource.

Now, let us understand endpoints with the aid of a table.

URI	HTTP 	Explanation
api/users	GET	Employed to fetch all the users
api/users	POST	Employed to add a user
api/users/2	PUT	Employed to update a user with id = 2
api/users/2/edit	GET	It shows the edited form of the user with id = 2
api/users/2	DELETE	Employed to delete a user with id = 2
api/users/2	GET	Get a user with id = 2

NOTE: To keep an API URI (Universal Resource Identifier) consistent, it is needed to use plurals in the URL.



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