>>> print '%(language)s has %(#)03d quote types.' % {'language': "Python", "#": 2}
Python has 002 quote types.
>>> print f
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/var/www/djatest/../djatest/users/models.py", line 22, in __str__
    return '%(language)s has %(#)03d quote types.' % {'language': "Python", "#": 2}
TypeError: not enough arguments for format string