步骤：

>>> from django.dispatch import Signal>>> custom_signal = Signal()>>>

2.为信号添加回调函数：

>>> def my_callback(sender, **more):...     print 'my callback called'...>>> custom_signal.connect(my_callback)>>>

3.实际调用

>>> class Demo:...     pass...>>> custom_signal.send(sender=Demo)my callback called[(
    
     , None)]>>>