一、Django框架之查漏补缺
1）models，字段概况
name = models.CharField(max_length=32)
age = models.IntegerField()
price = models.FloatField()
pub_date = models.DateField()
author = models.CharField(max_length=32,null=False)
gender = models.BooleanField # 布尔类型
gender = models.NullBooleanField # 可以为空的布尔类型
cs = models.ForeignKey("Class") # 一对多的外键
name = models.CharFie
