Python REST APIs With Flask, Connexion, and SQLAlchemy


A user can have many blogpost, so the relationship between users table and blogposts table will be one-to-many. So you may ask, why do we need a virtual environment in Python? It’s recommended to catch KeyError when using URL parameters as some users can change the URL which may return a Bad Request error page. How to become a DevOps engineer 5 easy steps Navigate back to sandbox which is root and create a file app.py. We’ll start by creating a folder and adding a venv folder within. Once installed, open up your terminal or cmd to install flask. To set up a Python server, you need to install Python, I would suggest any version above 3.7 as of the year 2019.

build simple restful api with python and flask part 1

In the end we also took a look at how to dockerize the API, which will facilitate the release of the application to the cloud. Application programming interfaces have made developers’ lives much easier and almost every developer has used APIs at some point. This article deals with the process of creating an API in Python What is IT Help Desk, Job Description, Certifications and Salary? using Flask. The theory of APIs, requests, responses, and methods are covered first before moving into a code-based hands-on example that will show you how to create an API. The code referenced in this article has been made open source and is available on GitHub; you can find the link to the repository at the end.

Creating Web APIs with Python and Flask

If you’re writing a web application, then you’re probably thinking about making HTTP calls to your server to get data to populate the dynamic parts of your application. When he’s not tinkering with electronics or building Django web apps, you can find him hiking the mountains of Taiwan or brushing up on his Chinese.

You’ll then explore various aspects of writing a REST API and get to grips with the Flask-RESTful API for more efficient development. As you advance, you’ll store and retrieve resources in an SQL database and simplify storage with Flask SQLAlchemy. Next, you’ll create user and item models and become familiar with the Git repository, workflow, and security. Finally, you’ll deploy Flask apps to Heroku and secure your REST API with DNS and SSL certificates.

HTTP Methods

As the transactions list deals with instances of Transaction and its subclasses, we just added the new Income in that list. Now that we have our application structured, we can start defining some relevant endpoints. As mentioned before, the goal of our application is to help users to manage incomes and expenses.

build simple restful api with python and flask part 1

You’ll also use JSON as your data format for all three frameworks. In this section, you’ll look at three popular frameworks for building REST APIs in Python. Each framework has pros and cons, so you’ll have to evaluate which works best for your needs. To this end, in the next sections, you’ll look at a REST API in each framework. All the examples will be for a similar API that manages a collection of countries. Now that you’ve covered endpoints, in the next section you’ll look at some options for formatting data in your REST API. You call requests.delete() with an API URL that contains the ID for the todo you would like to remove.

Building a simple REST API with NodeJS and Express.

The huge community that is forming around Python is improving every aspect of the language. More and more open source libraries are being released to address many different subjects, like Artificial Intelligence, Machine Learning, and web development. Besides the great support provided by the overall community, the Python Software Foundation also provides excellent documentation where new adopters can learn its essence fast. The Manager class keeps track of all the commands and handles how they are called from the command line.

Luckily, some great Python web frameworks abstract away the complexities of processing HTTP requests and returning responses. You know that the response was successful because of the 200 OK status code. The response also has a Content-Type header set to application/json. These six endpoints cover all the operations that you’ll need to create, read, update, and delete transactions in the web service. Each resource in your web service would have a similar list of endpoints based on what actions a user can perform with the API. A REST API exposes a set of public URLs that client applications use to access the resources of a web service.

Flask API example

Again after it completes the action, it will forget about it. Since a single entity has several functionalities, it can be thought of as a Book resource. GET HTTP Method– Retrieves specific information from the server. In this article, we will get familiar with APIs and REST APIs and then later build up our very own Flask REST API Application.

  • Besides providing helpful error messages, debug mode will trigger a reload of the application after all code changes.
  • In this section, you’ll look at some recommended steps to follow as you build an API.
  • Now that you’ve got requests installed, you can start sending HTTP requests.
  • A GET request would return user information back to the client.
  • A slug is a unique, URL-safe, mnemonic used for identifying a document.
  • In Part 2 of this Series, we’ll complete setting up blogpost endpoints.

Hence we have created a basic API which on browser return, hello but on the backend, you will get all the person’s information. On the command prompt, you can observe the following output. Here we imported create_app() function from src/app and call the function by passing our environment name(in this case “development”).

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In Part 1 of this two part video series, we will build a simple web application using Flask. Now that we have some idea about what an API is and how it works, let us try to get our hands dirty by creating one using Flask and then test it using Postman. For the sake of simplicity, we are going to read and write data to a CSV file that contains information about users. Each object is created by a self-invoking function returning its own API for use by the other pieces.

This helper function uses a generator expression to select all the country IDs and then calls max() on them to get the largest value. Now that you’ve got the background for the API, you can move on to the next section, where you’ll look at the REST API in Flask. As you can see, only the vin and color fields have been updated. With these endpoints, you can manage guests for a specific event in the system. This endpoint contains only a plural noun, and the HTTP method GET communicates the action. I really don’t know what is going on, all the relevant modules in apache are running but still cannot get this to work.

This status code tells a user that the operation was successful, but no content was returned in the response. There’s no reason to send a copy of it back in the response. This response contains a single JSON object with the car’s data. Since it’s a single object, it doesn’t need to be wrapped in a list.

  • As new Hugo winners were added to the database, the script that generated this visualization would immediately be able to use the new information.
  • The only value that this class adds for our application is that it hardcodes the type of the transaction.
  • For this tutorial, you will need Python 3 and the Flask web framework.
  • In your Python program, you’ve imported the Flask module, giving the application access to the Flask functionality.
  • This class inherits from another superclass called Schema that is defined on a package yet to be installed.
  • Check out our SQLAlchemy Tutorial if you have any doubts regarding SQLAlchemy.

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