validationerror django params

In Django, a ValidationError can occur when form data fails to validate. Here are the steps to handle a ValidationError with Django params:

1. Define a Django form class, and specify the validation rules for each field using the appropriate parameters in the Field class.
2. In the view function, instantiate the form class with the request parameters.
3. Call the is_valid() method on the form instance to trigger the validation process.
4. If the form data fails validation, a ValidationError will be raised, and you can access the error messages through the errors attribute of the form instance or handle it in a customized way.