Building a RESTful API with Flask: A Step-by-Step Guide by Aspen Wilson

Let’s create a folder named project (you can name it whatever you want), and open it using your favorite IDE. Open the terminal/command prompt and run the following to install the Flask module. Python is a beautiful programming language having a wide variety of usages. Ideal for beginners, the Flask module in Python is a very simple solution to build RESTful APIs.

Although you’re working with the person database table in this case, SQLAlchemy will take care that the note is added to the note table. Perfect, the API response with the note dataset looks exactly as expected! Next, you’ll use the same endpoint to update and delete a note. In the next section, you’ll extend your Flask REST API to create, read, update, and delete a single note. In the code above, you’re feeding your project’s database with the content of PEOPLE_NOTES.

Validating Responses:

Similar to Income, this class hardcodes the type of the transaction, but now it passes EXPENSE to the superclass. The difference is that it transforms the given amount to be negative. Therefore, no matter if the user sends a positive or a negative value, we will always store it as negative to facilitate calculations.

“Micro” does not mean that your whole web application has to fit into a single Python file (although it certainly can), nor does it mean that Flask is lacking in functionality. The “micro” in microframework means Flask aims to keep the core simple but extensible. Flask is a widely used micro web framework for creating APIs in Python. It is a simple yet powerful web framework that is designed to get started quickly and easily, with the ability to scale up to complex applications.

Displaying People With Their Notes

The config module provides the Connexion-flavored Flask app for you. Therefore, you don’t create a new Flask app in anymore, but reference config.connex_app in line 8. So you remove the import in line 4 and add the imports for config in line 5 and Person in line 6.

restful api python flask

You can protect your program by sanitizing all data that you get from the users of your application. Sanitizing data in this context means having your program examine the user-supplied data to make sure that it doesn’t contain anything dangerous to the program. This can be tricky to do right and would have to be done everywhere user data interacts with the database.

Securing Flask Applications: Best Practices and Techniques

To learn more about securing Python APIs with Auth0, take a look at this tutorial. The endpoint responsible for accepting new incomes was also refactored. The change on this endpoint was the addition of IncomeSchema to load an instance of Income based on the JSON data sent by the user. As the transactions list deals with instances of Transaction and its subclasses, we just added the new Income in that list. The huge community forming around Python is improving every aspect of the language.

This object must contain lname, which must not exist in the database already. The lname value is your identifier for your person, so you can’t have a person with the same last name multiple times restful api python flask in your database. You might be wondering why the timestamp in the above class defaults to and is updated by the datetime.utcnow() method, which returns a UTC, or Coordinated Universal Time.

First, run the above file, which will give you the localhost URL, and in another command prompt, run the below code file. In this part of the tutorial series, you created a comprehensive REST API with Python’s Flask web framework. With the Connexion module and some additional configuration work, useful documentation and an interactive system can be put in place. Unfortunately, any changes that you make won’t persist when you restart your Flask application. That’s why you’ll plug a proper database in to your project in the next part of this tutorial series.

restful api python flask

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