from django.dispatch import Signalclass_prepared = Signal(providing_args=["class"])pre_init = Signal(providing_args=["instance", "args", "kwargs"], use_caching=True)post_init = Signal(providing_args=["instance"], use_caching=True)pre_save = Signal(providing_args=["instance", "raw", "using", "update_fields"],                 use_caching=True)post_save = Signal(providing_args=["instance", "raw", "created", "using", "update_fields"], use_caching=True)pre_delete = Signal(providing_args=["instance", "using"], use_caching=True)post_delete = Signal(providing_args=["instance", "using"], use_caching=True)pre_syncdb = Signal(providing_args=["app", "create_models", "verbosity", "interactive", "db"])post_syncdb = Signal(providing_args=["class", "app", "created_models", "verbosity", "interactive", "db"])m2m_changed = Signal(providing_args=["action", "instance", "reverse", "model", "pk_set", "using"], use_caching=True)

from django.dispatch import Signaluser_logged_in = Signal(providing_args=[‘request‘, ‘user‘])user_login_failed = Signal(providing_args=[‘credentials‘])user_logged_out = Signal(providing_args=[‘request‘, ‘user‘])

from django.dispatch import Signalrequest_started = Signal()request_finished = Signal()got_request_exception = Signal(providing_args=["request"])

from django.dispatch import Signalconnection_created = Signal(providing_args=["connection"])

# Signal that the save is complete        if not meta.auto_created:            signals.post_save.send(sender=origin, instance=self, created=(not updated),                                   update_fields=update_fields, raw=raw, using=using)