python 内部类

 1 class Group(models.Model):
 2    
 3     name = models.CharField(_('name'), max_length=80, unique=True)
 4     permissions = models.ManyToManyField(
 5         Permission,
 6         verbose_name=_('permissions'),
 7         blank=True,
 8     )
 9 
10     objects = GroupManager()
11 
12     class Meta:
13         verbose_name = _('group')
14         verbose_name_plural = _('groups')
15 
16     def __str__(self):
17         return self.name
18 
19     def natural_key(self):
20         return (self.name,)

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