providing_args是一个提供给listeners的信号参数集合 e.x. ['obj']

class Signal([providing_args=list])

Defining signals

    import django.dispatch

    pizza_done=django.dispatch.Signal(providing_args=["toppings","size"])

Sending signals

classPizzaStore(object):

...
     def send_pizza(self, toppings, size):

         pizza_done.send(sender=self, toppings=toppings, size=size)

 

providing_args是一个提供给listeners的信号参数集合 e.x. ['obj']