[Python知识库]django之信号

1.目录结构

2.在Django/singals.py目录下编写?

# 系统自带的信号
from django.core.signals import request_finished
from django.db.models.signals import pre_save,post_save
from django.dispatch import receiver

@receiver(pre_save)
def pre_save_func(sender,**kwargs):
    print("pre_save_func")
    print("pre_save_msg:",sender,kwargs)

@receiver(post_save)
def post_save_func(sender,**kwargs):
    print("post_save_func")
    print("post_save_msg:",sender,kwargs)

@receiver(request_finished)
def callback(sender, **kwargs):
    print("Request finished!")

# 自定义信号
import django.dispatch

# providing_args是发送信号时传递给的参数，最后都会被kwargs接收
custom_signal=django.dispatch.Signal(providing_args=["aaaa","bbbb"])
def pre_save_func2(sender,**kwargs):
    print("pre_save_func")
    print("pre_save_msg:",sender,kwargs)
custom_signal.connect(pre_save_func2)

3.将custom_signal自定义信号对象加入到Django/__init__.py中

4.自定义的需要手动触发信号，系统自带的，会自动触发

响应结果结果：

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