You're doing something very odd. You have django model code, which defines Field objects which contain no value. Only instances contain field values (you're defining things on the class level) so whatever you're doing should be put in a class method.
Perhaps you're confused because django's metaclass magic converts references to those attributes to python values from the database?
class MyModel(models.Model):
foo = models.DateField()
print foo # is a models.DateField
def get_foo_after_django_magic(self):
print self.foo # is a datetime() instance