How to refer to own constant when creating a class?

Question

Django

When creating a class, it is not possible to refer to the own constant Tag.TYPE_KEYWORD, because the class has not yet been created.
Are there any solutions other than putting a number on the last line right away?

class Tag(models.Model):
    TYPE_KEYWORD = '1'
    TYPE_TOPIC = '2'
    
    type = models.IntegerField(default=Tag.TYPE_KEYWORD)

Answer 1

class Tag(models.Model):
    TYPE_KEYWORD = '1'
    TYPE_TOPIC = '2'
    
    type = models.IntegerField(default=TYPE_KEYWORD)

Answer 2

class Foo:
    class Meta:
        TYPE_KEYWORD = '1'

    tp = Meta.TYPE_KEYWORD

# или
class Bar:
    foo = 3
    bar = {'key': 'value', 2: foo}
    baz = bar[2]
    qux = bar['key']

Maybe it will work somehow. In general, classes that extend models.Model are created using the magic of metaclasses, and it’s possible that it won’t work anyway. When creating regular classes, everything works without crutches.

Answer 3

Create a file constants.py inside the application, write constants there and connect it to the model or view.