This document describes the current stable version of Celery (3.1). For development docs, go here.


“Safe weakrefs”, originally from pyDispatcher.

Provides a way to safely weakref any function, including bound methods (which aren’t handled by the core weakref module).

celery.utils.dispatch.saferef.safe_ref(target, on_delete=None)[source]

Return a safe weak reference to a callable target

  • target – the object to be weakly referenced, if it’s a bound method reference, will create a BoundMethodWeakref, otherwise creates a simple weakref.ref.
  • on_delete – if provided, will have a hard reference stored to the callable to be called after the safe reference goes out of scope with the reference object, (either a weakref.ref or a BoundMethodWeakref) as argument.

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