Python Fullstack Development-An E-Commerce Website - Flask - Advanced Validations - Python in Tamil

Web forms, such as text fields and text areas, give users the ability to send data to your application, whether that’s a drop-down or a radio button that the application will use to perform an action, or to send large areas of text to be processed or displayed. For example, in a social media application, you might give users a box where they can add new content to their pages.

Flask is a lightweight Python web framework that provides useful tools and features for creating web applications in the Python Language. To render and validate web forms in a safe and flexible way in Flask, you’ll use Flask-WTF, which is a Flask extension that helps you use the WTForms library in your Flask application.

WTForms is a Python library that provides flexible web form rendering. You can use it to render text fields, text areas, password fields, radio buttons, and others. WTForms also provides powerful data validation using different validators, which validate that the data the user submits meets certain criteria you define. For example, if you have a required field, you can ensure data the user submits is provided, or has a certain length.

WTForms also uses a CSRF token to provide protection from CSRF attacks, which are attacks that allows the attacker to execute unwanted actions on a web application in which the user is authenticated. A successful CSRF attack can force the user to perform state-changing requests like transferring funds to the attacker’s bank account in a banking application, changing the user’s email address, and so forth. If the victim is an administrative account, CSRF can compromise the entire web application.