Django where to store model-level variables

So I have my model:

from django.db import models

x_default_coordinate = 0
y_default_coordinate = 0

class MyModel(models.Model):
  location1 = gis_models.PointField(
        srid=4326, default=Point(x_default_coordinate, y_default_coordinate)
    )
  location2 = gis_models.PointField(
        srid=4326, default=Point(x_default_coordinate, y_default_coordinate)
    )

Where would be an appropriate place to store the default coordinates? Currently I have them as shown, but that doesn't seem right.

I'm not familiar with the Point object and whatever package you are using, so I'm going to answer your question assuming that Point is a mutable object.

The docs for Field.default:

The default can’t be a mutable object (model instance, list, set, etc.), as a reference to the same instance of that object would be used as the default value in all new model instances. Instead, wrap the desired default in a callable.

To avoid accidentally mutating the default object, you should wrap the default in a callable:

DEFAULT_X = 0
DEFAULT_Y = 0

def get_default_point():
    return Point(DEFAULT_X, DEFAULT_Y)


class MyModel(models.Model):
    location1 = gis_models.PointField(srid=4326, default=get_default_point)
    ....