Trouble with _unicode() method in django

Question

I'm adding a unicode() method to my model, however when displaying all objects in the interactive it's not working.

import datetime
from django.db import models
from django.utils import timezone

class Poll(models.Model):
    question = models.CharField(max_length=200)
    pub_date = models.DateTimeField('date published')
    def _unicode_(self):
        return self.question
    def was_published_recently(self):
        return self.pub_date >= timezone.now() - datetime.timedelta(days=1)

class Choice(models.Model):
    poll = models.ForeignKey(Poll)
    choice = models.CharField(max_length=200)
    votes = models.IntegerField()
    def _unicode_(self):
        return self.choice
# Create your models here.

(InteractiveConsole

>>> from polls.models import Poll, Choice
>>> Poll.objects.all()
[<Poll: Poll object>]

Answer 1

They need to be named __unicode__ (two underscores on either side). This is an awkward detail of Python reserved methods that is not immediately obvious by looking at them.