New method in Django 3
you can use Field.choices Enumeration Types new update in django3 like this :
from django.db import models
class Status(models.TextChoices):
UNPUBLISHED = 'UN', 'Unpublished'
PUBLISHED = 'PB', 'Published'
class Book(models.Model):
status = models.CharField(
max_length=2,
choices=Status.choices,
default=Status.UNPUBLISHED,
)