[issue23841] py34 OrderedDict is using weakref for root reference

[Antoine Pitrou]

Antoine Pitrou added the comment:

Concretely, the possible workarounds are:

- don't do anything complex in your __del__
- be prepared to deal with unexpected errors in your __del__
- starting from Python 3.4, don't define __del__ and use weakref.finalize() instead: https://docs.python.org/3/library/weakref.html#weakref.finalize

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