text: from django.contrib.auth.base_user import BaseUserManager
  from django.utils.translation import gettext as _
  class UserManager(BaseUserManager):
      use_in_migrations = True
  
      def _create_user(self, email, password, **extra_fields):
          """
          Creates and saves a User with the given email and password.
          """
          if not email:
              raise ValueError('The given email must be set')
          email = self.normalize_email(email)
          user = self.model(email=email, **extra_fields)
          user.set_password(password)
          user.save(using=self._db)
          return user
  
      def create_user(self, email, password=None, **extra_fields):
          if not email:
              raise ValueError(_('The Email must be set'))
          email = self.normalize_email(email)
          user = self.model(email=email, **extra_fields)
          user.set_password(password)
          user.save()
          return user
  
      def create_superuser(self, email, password, **extra_fields):
          extra_fields.setdefault('is_staff', True)
          extra_fields.setdefault('is_superuser', True)
          extra_fields.setdefault('is_active', True)
  
          if extra_fields.get('is_staff') is not True:
              raise ValueError(_('Superuser must have is_staff=True.'))
          if extra_fields.get('is_superuser') is not True:
              raise ValueError(_('Superuser must have is_superuser=True.'))
          return self.create_user(email, password, **extra_fields)