django choices字段值 在django中实现choices字段获取对应字段值

class Area(models.Model):
  Area_Level = (
     (0, u'全国'),
     (1, u'省、直辖市'),
     (2, u'市、直辖市区'),
     (3, u'区、县等'),
  )
areaname = models.CharField(max_length=30,unique=True, verbose_name='区域名称')
code = models.CharField(max_length=20,blank=True, default="", verbose_name='区域代码')
parentid = models.IntegerField(verbose_name='父级id', null=True)
level = models.IntegerField(choices=Area_Level,verbose_name='层级', null=True)

LOGGING = {
  'version':1,
  'disable_existing_loggers':False,
  'handlers':{
    'console':{
      'level':'DEBUG',
      'class':'logging.StreamHandler',
    },
  },
  'loggers':{
    'django.db.backends':{
      'handlers':['console'],
      'propagate':True,
      'level':'DEBUG'
    },
  }
}