unsupported opperand type(s)

Hi guys.

I'm just going through the official tutorial for Django: "Writing your first Django app, part 1"

At the bottom of the page it says:
# Make sure our custom method worked.
>>> p = Poll.objects.get(pk=1)
>>> p.was_published_recently()
True

So far everything went well but now cmd returns:
TypeError: unsupported operand type(s) for -: 'function' and
'datetime.timedelta'



WHAT CAN I DO TO FIX IT??
So far my cone in \polls\models.py:



from django.db import models
import datetime
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

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