"""

Callable defaults

You can pass callable objects as the ``default`` parameter to a field. When

the object is created without an explicit value passed in, Django will call

the method to determine the default value.

This example uses ``datetime.datetime.now`` as the default for the ``pub_date``

field.

"""

from datetime import datetime

from django.db import models

class Article(models.Model):

    headline = models.CharField(max_length=100, default="Default headline")

    pub_date = models.DateTimeField(default=datetime.now)

    def __str__(self):

        return self.headline