Antoine Pitrou <pit...@free.fr> added the comment:

Here's another idea: have a new type field (a tp_something) that exposes the GC 
priority for this type.  It could be an integer between -8 and 7, for example 
(0 being the default).  Then tp_finalize would be called in sorted priority 
order.

The tricky part of course is to make this acceptable performance-wise (i.e. 
avoid walking the collectable list 16 times, once for each priority level).  
For example by creating bucket lists for each priority level (only for objects 
with a non-NULL tp_finalize).

----------
stage: patch review -> needs patch

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue17852>
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