django signal

django.contrib.auth.signals.py

from django.dispatch import Signal
user_logged_in = Signal(providing_args=['request', 'user'])




django.contrib.auth.models.py

from django.contrib.auth.signals import user_logged_in
def update_last_login(sender, user, **kwargs):
    """
    A signal receiver which updates the last_login date for
    the user logging in.
    """
    user.last_login = datetime.datetime.now()
    user.save()

user_logged_in.connect(update_last_login)




django.contrib.auth._init_.py
def login(request, user):
    user_logged_in.send(sender=user.__class__, request=request, user=user)