How to make a simple CRUD with Python and Flask

In this article, you will learn to create a Crud (Create, Read, Update, Delete) Simple using python and flask.

Flask, being a python micro-framework, offers a simple and flexible way to implement these features, ideal for both those starting and for more experienced developers.

Let's explore the main concepts and practices together to develop a Python and Flask Crud:

• What is Crud and why it is important in web development.
• Introduction to Flask, a Python micro-framework.
• How to configure your development environment.
• CRUD project structure using Python and Flask.
• How to connect to the database to store the data.
• Tests to ensure that CRUD works properly.
• Tips for optimizing your application and code.

Flask Introduction

Flask is a python-developed micro-framework designed to make it easier to create web applications.

This makes it an excellent choice for both small applications and more complex projects.

The Flask community is active, and documentation is complete, which facilitates learning and development.

In addition, there are many extensions available, which make development even faster and more efficient.

What is a crud?

Crud is a acronym that represents the four basic operations for data manipulation in one application: Create (Create), Read (read), Update (update) e Delete (Delete).

Here is a summary of CRUD operations:

• Create: Adds new records to the database.
• Read: Displays the information already stored.
• Update: Modifies existing data.
• Delete: Removes records that are no longer needed.

Why use python to create a crud?

Python is a programming language famous for its simplicity and readability, which facilitates the creation of a CRUD.

It allows developers to focus on business logic without worrying about complicated syntax.

With Python, you also have access to a wide variety of development libraries, such as Flask and SQLALCHEMY, which facilitate integration with databases and user authentication.

The strong Python community supports continuous support through tutorials, forums and documentation, which helps both beginners and experienced developers to overcome challenges quickly.

Preparing the development environment

Before you start developing a Python and Flask Crud, it is important to prepare your development environment.

First, install Python on your system, which can be done directly from the official Python website.

The installation of a package manager like the pip It is also essential to add the libraries necessary to your project.

Choosing a good code editor, such as Visual Studio Code or Pycharm, is critical to facilitating development.

These editors offer advanced features such as autocompleting and plugins support, as well as an integrated terminal to execute commands and interact with their application.

Flask Installation

Installing Flask is the first step in starting to develop with this micro-framework. pip, the command to install Flask is simple:

PIP INSTALL FLASK

It is a good practice to activate a virtual environment before installing Flask.

Project Structure

A good design structure facilitates the development and maintenance of the application.

Here is a basic structure for a Flask project:

• APP/: Contains the main file of the application, as app.py.
• Templates/: Stores the HTML files to render the pages.
• STATIC/: Contains static files such as CSS, JavaScript and images.
• Config/: Stores environment settings and project constants.
• VENV/: Virtual environment to manage project dependencies.

Making a Crud with Python

With Flask, creating a CRUD involves defining routes that connect URLs to the functions that perform each operation.

For each of the CRUD operations, as /Create, /Read, /update e /Delete, we use the decorator @app.rout ().

Routes Implementation

The organization of routes is essential for the functioning of CRUD.

Operation	Route	Http method
To create	/Create	Post
To read	/Read	Get
To update	/update	Put
Delete	/Delete	Delete

Creating the user interface

A friendly user interface is crucial to the success of CRUD.

Elements such as forms, buttons and tables are important to ensure a good experience to the user.

Connecting to the database

For CRUD to work properly, it is essential to connect Flask to a database.

Using SQLALCHEMY, an Object-Relational Mapping (ORM) library, facilitates this integration further, allowing you to interact with the database using simple python commands.

Testing the created Crud

Testing CRUD is essential to ensure that all features are working as expected.

Debugging tools and automated tests, such as pytest, are very useful for validating the code and identifying errors quickly.

Optimizing code and application

After creating CRUD, it is important to optimize both code and application.

Conclusion

Building a simple Python and Flask Crud is an excellent exercise to learn the foundations of web development.

This project helps you understand important concepts such as route creation, database connection and user interface development.

It is an important step for those starting and want to delve into the web development world with Python.

Creating a raw is just the beginning.