Managed to commit some debugging code.

examples/pythonproject/demoapp/tasks.py

@@ -1,17 +1,10 @@
 from celery.decorators import task
-from celery.signals import task_postrun
 
 
 @task()
 def add(x, y):
     return x + y
 
-def sigdump(**kwargs):
-    from celery.log import setup_logger
-    logger = setup_logger()
-    logger.error("Received signal: %s" % repr(kwargs))
-task_postrun.connect(sigdump)
-
 
 @task()
 def mul(x, y):