How to make email field unique in model User from contrib.auth in Django

Question

I need to patch the standard User model of contrib.auth by ensuring the email field entry is unique:

User._meta.fields[4].unique = True
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Answer 1

I went to \Lib\site-packages\django\contrib\auth\models and in class AbstractUser(AbstractBaseUser, PermissionsMixin): I changed email to be:

email = models.EmailField(_('email address'), **unique=True**, blank=True)

With this if you try to register with email address already present in the database you will get message: User with this Email address already exists.