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Python

from django.contrib.auth.models import AbstractUser, UserManager as DjangoUserManager
from django.core import validators
from django.db import models
from django.utils.deconstruct import deconstructible
from django.utils.translation import gettext_lazy as _
@deconstructible
class UnicodeUsernameValidator(validators.RegexValidator):
regex = r"^[\w.-]+\Z"
message = _("Enter a valid username. This value may contain only letters, " "numbers, and ./-/_ characters.")
flags = 0
class UserManager(DjangoUserManager):
def get_by_natural_key(self, username):
return self.get(**{self.model.USERNAME_FIELD + "__iexact": username})
class User(AbstractUser):
username_validator = UnicodeUsernameValidator()
objects = UserManager()
username = models.CharField(
_("username"),
max_length=150,
unique=True,
help_text=_("Required. 150 characters or fewer. Letters, digits and ./-/_ only."),
validators=[username_validator],
error_messages={"unique": _("A user with that username already exists."),},
)
@classmethod
def normalize_username(cls, username):
return super().normalize_username(username).lower()