Django email as username

email_as_username.py

### models.py
from django.contrib.auth.models import AbstractBaseUser, PermissionsMixin, BaseUserManager
from django.core.mail import send_mail
from django.db import models
from django.utils import timezone
from django.utils.translation import ugettext_lazy as _


class UserManager(BaseUserManager):
    use_in_migrations = True

    def _create_user(self, email, password, is_staff, is_superuser, **extra_fields):
        now = timezone.now()
        if not email:
            raise ValueError('The given username must be set')
        email = self.normalize_email(email)
        user = self.model(email=email, is_staff=is_staff, is_active=True, is_superuser=is_superuser, date_joined=now, **extra_fields)
        user.set_password(password)
        user.save(using=self._db)
        return user

    def create_user(self, email, password=None, **extra_fields):
        return self._create_user(email, password, False, False, **extra_fields)

    def create_superuser(self, email, password, **extra_fields):
        return self._create_user(email, password, True, True, **extra_fields)

class AbstractUserEmail(AbstractBaseUser, PermissionsMixin):
    email = models.EmailField(_('email address'), unique=True, error_messages={'unique': _("A user with that username already exists.")})
    first_name = models.CharField(_('first name'), max_length=30, blank=True)
    last_name = models.CharField(_('last name'), max_length=30, blank=True)
    is_staff = models.BooleanField(_('staff status'), default=False, help_text=_('Designates whether the user can log into this admin site.'))
    is_active = models.BooleanField(_('active'), default=True, help_text=_('Designates whether this user should be treated as active. Unselect this instead of deleting accounts.'))
    date_joined = models.DateTimeField(_('date joined'), default=timezone.now)

    objects = UserManager()

    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = []

    class Meta:
        verbose_name = _('user')
        verbose_name_plural = _('users')
        abstract = True

    def get_full_name(self):
        full_name = '%s %s' % (self.first_name, self.last_name)
        return full_name.strip()

    def get_short_name(self):
        return self.first_name

    def email_user(self, subject, message, from_email=None, **kwargs):
        send_mail(subject, message, from_email, [self.email], **kwargs)



class User(AbstractUserEmail):
    pass




#### admin_forms.py
from django.db import models
from django import forms
from accounts.models import User
from django.utils.translation import ugettext_lazy as _


class UserCreationForm(forms.ModelForm):
    error_messages = {
        'password_mismatch': _("The two password fields didn't match."),
    }
    password1 = forms.CharField(label=_("Password"), widget=forms.PasswordInput(render_value=True))
    password2 = forms.CharField(label=_("Password confirmation"), widget=forms.PasswordInput(render_value=True), help_text=_("Enter the same password as above, for verification."))

    class Meta:
        model = User
        fields = ("email", "member")

    def __init__(self, *args, **kwargs):
        super(UserCreationForm, self).__init__(*args, **kwargs)

    def clean_password2(self):
        password1 = self.cleaned_data.get("password1")
        password2 = self.cleaned_data.get("password2")
        if password1 and password2 and password1 != password2:
            raise forms.ValidationError(
                self.error_messages['password_mismatch'],
                code='password_mismatch',
            )
        return password2

    def save(self, commit=True):
        user = super(UserCreationForm, self).save(commit=False)
        user.set_password(self.cleaned_data["password1"])
        if commit:
            user.save()
        return user



#### admin.py
from accounts.models import User
from django.contrib import admin
from django.contrib.auth.admin import UserAdmin as UserAdminOrig
from django.contrib.auth.models import Group
from django.utils.translation import ugettext_lazy as _
from accounts.admin_forms import UserCreationForm


admin.site.unregister(Group)

class UserAdmin(UserAdminOrig):
    readonly_fields = ('last_login', 'date_joined')
    list_display = ('email', 'first_name', 'last_name', 'is_staff')
    list_filter = ('is_staff', 'is_active', 'member')
    fieldsets = (
        (None, {'fields': ('email', 'password', 'last_login', 'date_joined')}),
        (_('Personal info'), {'fields': ('first_name', 'last_name',)}),
        (_('Permissions'), {'fields': ('is_active', 'is_staff', 'is_superuser')}),
    )
    add_fieldsets = (
        (None, {
            'classes': ('wide',),
            'fields': ('email', 'password1', 'password2'),
        }),
    )
    ordering = ('email',)
    add_form = UserCreationForm

admin.site.register(User, UserAdmin)