# Base form classes

Several form classes are provided with django-registration, covering common cases for gathering account information and implementing common constraints for user registration. These forms were designed with django-registration’s built-in registration workflows in mind, but may also be useful in other situations.

class `registration.forms.``RegistrationForm`

  A simple form for registering an account. This is a subclass of Django’s built-in `UserCreationForm`, and has the following fields, all of which are required:

  `username`

    The username to use for the new account. This is represented as a text input which validates that the username is unique, consists entirely of alphanumeric characters and underscores and is at most 30 characters in length.

  `email`

    The email address to use for the new account. This is represented as a text input which accepts email addresses up to 75 characters in length.

  `password1`

    The password to use for the new account. This is represented as a password input (`input type="password"` in the rendered HTML).

  `password2`

    The password to use for the new account. This is represented as a password input (`input type="password"` in the rendered HTML).

  Because this is a subclass of Django’s own `UserCreationForm`, the constraints on usernames and email addresses match those enforced by Django’s default authentication backend for instances of `django.contrib.auth.models.User`. The repeated entry of the password serves to catch typos.

  Note

  Unicode usernames

  There is one important difference in form behavior depending on the version of Python you’re using. Django’s username validation regex allows a username to contain any word character along with the following set of additional characters: `.@+-`. However, on Python 2 this regex uses the `ASCII` flag (since Python 2’s string type is ASCII by default), while on Python 3 it uses the `UNICODE` flag (since Python 3’s string type is Unicode). This means that usernames containing non-ASCII word characters are only permitted when using Python 3.

  The validation error for mismatched passwords is attached to the `password2` field. This is a backwards-incompatible change from django-registration 1.0.

  Note

  Validation of usernames

  Because it’s a subclass of Django’s `UserCreationForm`, `RegistrationForm` will inherit the base validation defined by Django. It also adds a custom `clean()` method which applies one custom validator: `ReservedNameValidator`. See the documentation for `ReservedNameValidator` for notes on why it exists and how to customize its behavior.

class `registration.forms.``RegistrationFormTermsOfService`

  A subclass of `RegistrationForm` which adds one additional, required field:

  `tos`

    A checkbox indicating agreement to the site’s terms of service/user agreement.

class `registration.forms.``RegistrationFormUniqueEmail`

  A subclass of `RegistrationForm` which enforces uniqueness of email addresses in addition to uniqueness of usernames.

class `registration.forms.``RegistrationFormNoFreeEmail`

  A subclass of `RegistrationForm` which disallows registration using addresses from some common free email providers. This can, in some cases, cut down on automated registration by spambots.

  By default, the following domains are disallowed for email addresses:

  - `aim.com`

  - `aol.com`

  - `email.com`

  - `gmail.com`

  - `googlemail.com`

  - `hotmail.com`

  - `hushmail.com`

  - `msn.com`

  - `mail.ru`

  - `mailinator.com`

  - `live.com`

  - `yahoo.com`

  To change this, subclass this form and set the class attribute `bad_domains` to a list of domains you wish to disallow.