I actually appreciate that API change, as it makes my use of resources more explicit. However, you might be interested in using ``weakref.finalize`` to keep th

I actually appreciate that API change, as it makes my use of resources more explicit. However, you might be interested in using ``weakref.finalize`` to keep that C++ style. https://docs.python.org/3.6/library/weakref.html#comparing-finalizers-with-del-methods https://docs.python.org/3.6/library/weakref.html#comparing-f...