__init__() missing 1 required positional argument: 'on_delete'

from django.db import models

# Create your models here.
class BookInfo(models.Model):
    """
    定义书籍信息模型类
    """
    # 设计name属性
    name = models.CharField(max_length=10)

class PeopleInfo(models.Model):
    """
    定义人物信息模型类
    """
    name = models.CharField(max_length=10)
    gender = models.BooleanField()
    book = models.ForeignKey(BookInfo)

models.ForeignKey(BookInfo)  少位置参数on_delete

解决方法：

一个人可以拥有多本数，一对多，多方持有一方的外键

book = models.ForeignKey(BookInfo)
改为：
book = models.ForeignKey(BookInfo,on_delete = models.CASCADE)