How to use the weblate.auth.models.User function in weblate

# Store activity log and notify
    AuditLog.objects.create(user, request, 'removed')

    # Remove any email validation codes
    invalidate_reset_codes(user)

    # Change username
    user.username = 'deleted-{0}'.format(user.pk)
    user.email = 'noreply+{}@weblate.org'.format(user.pk)
    while User.objects.filter(username=user.username).exists():
        user.username = 'deleted-{0}-{1}'.format(
            user.pk,
            binascii.b2a_hex(os.urandom(5))
        )
    while User.objects.filter(email=user.email).exists():
        user.email = 'noreply+{0}-{1}@weblate.org'.format(
            user.pk,
            binascii.b2a_hex(os.urandom(5))
        )

    # Remove user information
    user.full_name = 'Deleted User'

    # Disable the user
    user.is_active = False
    user.set_unusable_password()
    user.save()

    # Remove all social auth associations
    user.social_auth.all().delete()

def handle(self, *args, **options):
        """Create admin account with admin password.

        This is useful mostly for setup inside appliances, when user wants
        to be able to login remotely and change password then.
        """
        try:
            user = User.objects.filter(
                Q(username=options['username']) | Q(email=options['email'])
            ).get()
        except User.DoesNotExist:
            user = None
        except User.MultipleObjectsReturned:
            raise CommandError('Multiple users matched given parameters!')

        if user and not options['update']:
            raise CommandError('User exists, specify --update to update existing')

        if options['no_password']:
            password = None
        elif options['password']:
            password = options['password']
        else:
            password = make_password(13)
            self.stdout.write('Using generated password: {}'.format(password))

        if user and options['update']:
            self.stdout.write('Updating user {}'.format(user.username))
            user.email = options['email']

def try_get_user(username, list_all=False):
    """Wrapper to get User object for authentication."""
    if list_all:
        method = User.objects.filter
    else:
        method = User.objects.get
    if '@' in username:
        return method(email=username)
    return method(username=username)

@receiver(post_save, sender=User)
@disable_for_loaddata
def create_profile_callback(sender, instance, created=False, **kwargs):
    """Automatically create token and profile for user."""
    if created:
        # Create API token
        Token.objects.create(user=instance, key=get_random_string(40))
        # Create profile
        Profile.objects.create(user=instance)
        # Create subscriptions
        if not instance.is_anonymous:
            create_default_notifications(instance)

def authenticate(self, request, username=None, password=None, **kwargs):
        """Prohibit login for anonymous user and allows to login by e-mail."""
        if username == settings.ANONYMOUS_USER_NAME or username is None:
            return None

        try:
            user = try_get_user(username)
            if user.check_password(password):
                return user
        except (User.DoesNotExist, User.MultipleObjectsReturned):
            pass
        return None

@python_2_unicode_compatible
class Billing(models.Model):
    STATE_ACTIVE = 0
    STATE_TRIAL = 1
    STATE_EXPIRED = 2
    STATE_TERMINATED = 3

    EXPIRING_STATES = (STATE_TRIAL,)

    plan = models.ForeignKey(
        Plan, on_delete=models.deletion.CASCADE, verbose_name=_('Billing plan')
    )
    projects = models.ManyToManyField(
        Project, blank=True, verbose_name=_('Billed projects')
    )
    owners = models.ManyToManyField(User, blank=True, verbose_name=_('Billing owners'))
    state = models.IntegerField(
        choices=(
            (STATE_ACTIVE, _('Active')),
            (STATE_TRIAL, _('Trial')),
            (STATE_EXPIRED, _('Expired')),
            (STATE_TERMINATED, _('Terminated')),
        ),
        default=STATE_ACTIVE,
        verbose_name=_('Billing state'),
    )
    expiry = models.DateTimeField(
        blank=True,
        null=True,
        default=None,
        verbose_name=_('Trial expiry date'),
        help_text='After expiry removal with 15 days grace period is scheduled.',

def delete_user(request, project):
    """Remove user from a project."""
    obj, form = check_user_form(request, project, True)

    if form is not None:
        owners = User.objects.all_admins(obj)
        user = form.cleaned_data['user']
        is_owner = owners.filter(pk=user.pk).exists()
        if is_owner and owners.count() <= 1:
            messages.error(request, _('You can not remove last owner!'))
        else:
            obj.remove_user(user)
            Change.objects.create(
                project=obj,
                action=Change.ACTION_REMOVE_USER,
                user=request.user,
                details={'username': user.username},
            )
            messages.success(
                request, _('User has been removed from this project.')
            )

from weblate.accounts.avatar import get_user_display
from weblate.accounts.data import create_default_notifications
from weblate.accounts.notifications import FREQ_CHOICES, NOTIFICATIONS, SCOPE_CHOICES
from weblate.accounts.tasks import notify_auditlog
from weblate.auth.models import User
from weblate.lang.models import Language
from weblate.utils import messages
from weblate.utils.decorators import disable_for_loaddata
from weblate.utils.fields import JSONField
from weblate.utils.render import validate_editor
from weblate.utils.request import get_ip_address, get_user_agent


@python_2_unicode_compatible
class Subscription(models.Model):
    user = models.ForeignKey(User, on_delete=models.deletion.CASCADE)
    notification = models.CharField(
        choices=[n.get_choice() for n in NOTIFICATIONS], max_length=100
    )
    scope = models.IntegerField(choices=SCOPE_CHOICES)
    frequency = models.IntegerField(choices=FREQ_CHOICES)
    project = models.ForeignKey(
        'trans.Project', on_delete=models.deletion.CASCADE, null=True
    )
    component = models.ForeignKey(
        'trans.Component', on_delete=models.deletion.CASCADE, null=True
    )

    class Meta(object):
        unique_together = [('notification', 'scope', 'project', 'component', 'user')]

    def __str__(self):