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If your Django application has a REST API and you’re not using Django REST framework (or a similar framework) then you’ll find yourself writing lots of code for validating incoming data.

If you’re manually rendering a form, you can access these CSS classes using the parameter allows you to override any previously set suffix.

In this dictionary, the keys are the field names, and the values are lists of strings representing the error messages.

The error messages are stored in lists because a field can have multiple error messages. This enables things like rewriting the error’s message or writing custom logic in a view when a given error is present.

This argument, if given, should be a dictionary mapping field names to initial values.

Only include the fields for which you’re specifying an initial value; it’s not necessary to include every field in your form.