<s> from django . conf import settings <EOL> from django . db import models <EOL> from django . utils . encoding import python_2_unicode_compatible <EOL> @ python_2_unicode_compatible <EOL> class Book ( models . Model ) : <EOL> isbn = models . CharField ( max_length = <NUM_LIT:50> , unique = True ) <EOL> title = models . CharField ( max_length = <NUM_LIT:100> ) <EOL> author = models . ForeignKey ( settings . AUTH_USER_MODEL ) <EOL> def __str__ ( self ) : <EOL> return self . title </s>
