title: django error: 'unicode' object is not callable
body: <p>im attempting to do the django tutorial from the django website, and ive run into a bit of an issue: ive got to adding my <code>__unicode__</code> methods to my models classes, but when ever i try to return the objects of that model i get the following error:</p>
  
  <pre><code>in __unicode__
      return self.question()
  TypeError: 'unicode' object is not callable
  </code></pre>
  
  <p>im fairly new to python and very new to django, and i cant really see what ive missed here, if someone could point it out id be very grateful. A bit of code:</p>
  
  <p>My models.py:</p>
  
  <pre><code># The code is straightforward. Each model is represented by a class that subclasses django.db.models.Model. Each model has a number of 
  # class variables, each of which represents a database field in the model.
  
  from django.db import models
  
      class Poll(models.Model):
          question = models.CharField(max_length=200)
          pub_date = models.DateTimeField('date published') 
  
          def __unicode__(self):
              return self.question
  
  
      class Choice(models.Model):
          poll = models.ForeignKey(Poll) 
          choice = models.CharField(max_length=200) 
          votes = models.IntegerField()
  
          def __unicode__(self):
              return self.choice()
  </code></pre>
  
  <p>and in the interactive shell:</p>
  
  <pre><code>from pysite.polls.models import Poll, Choice
  Poll.objects.all()
  </code></pre>