How does Python handle form validation in web applications?

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Python handles form validation in web applications primarily through web frameworks like Django, Flask, and FastAPI, each offering different approaches:

1. Django:

Django includes a robust forms framework. Developers define form classes using django.forms, specifying fields and validation rules. Built-in validators (e.g., required, max_length) and custom validation methods (clean() or clean_<fieldname>()) handle errors. When a form is submitted, Django checks validity with form.is_valid(), and errors can be displayed in templates.

2. Flask:

Flask uses extensions like WTForms for form handling. WTForms provides field definitions and validation logic. Validation is done automatically on form submission with form.validate_on_submit().

3. Fast API:

Fast API uses Pydantic models for request validation. Fields and their types are declared, and validation is automatic—errors are returned as JSON responses.

In all cases, Python simplifies validation through declarative syntax, reusable components, and integration with HTML rendering and error messaging.

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