django模型 choices字段

from django.db import models

# Create your models here.
class Department(models.Model):
    """
    部门表
    """
    title = models.CharField(verbose_name="部门",max_length=32)
    def __str__(self):
        return self.title
class UserInfo(models.Model):
    """
    用户表
    """
    phone = models.CharField(verbose_name="联系方式",max_length=32)
    level_choices = ( #############3
        (1,'T1'),
        (2,'T2'),
        (3,'T3'),
    )
    level = models.IntegerField(verbose_name="级别",choices=level_choices) ##########
    depart = models.ForeignKey(verbose_name='部门',to='Department',on_delete=models.CASCADE)