content: from django.core.exceptions import ValidationError
  from django.utils.translation import gettext as _
  
  
  class AlphanumericPasswordValidator:
      """
      Validate that the password has at least one numeral, one uppercase letter and one lowercase letter.
      """
  
      def validate(self, password, user=None):
          if not any(char.isdigit() for char in password):
              raise ValidationError(
                  _("Password must have at least one numeral."),
              )
  
          if not any(char.isupper() for char in password):
              raise ValidationError(
                  _("Password must have at least one uppercase letter."),
              )
  
          if not any(char.islower() for char in password):
              raise ValidationError(
                  _("Password must have at least one lowercase letter."),
              )
  
      def get_help_text(self):
          return _("Your password must contain at least one numeral, one uppercase letter and one lowercase letter.")
  