getting current user in django

def sample_view(request):
    current_user = request.user
    print current_user.id

author = models.ForeignKey(settings.AUTH_USER_MODEL)

if request.user.is_authenticated:
    # Do something for authenticated users.
else:
    # Do something for anonymous users.

author = models.ForeignKey(settings.AUTH_USER_MODEL)

author = models.ForeignKey(settings.AUTH_USER_MODEL)