Nick Coghlan added the comment: Adding Guido because this appears to be due to a longstanding difference between the handling of tp_del and most other slots
Specifically, the reason for the odd behaviour appears to be that generator objects define tp_del [1] (which is what the cyclic gc *really* looks for), but while defining __del__ in Python will populate tp_del in the type slots, defining tp_del directly in a builtin or extension type doesn't create an exposed __del__ at the Python level (there's no wrapper function identified in the slot definition). So, at the very least, the fact that builtin and extension types can define tp_del without creating a visible __del__ method needs to be documented as a CPython implementation detail. However, I'm not sure we actually have a good *reason* for tp_del failing to generate __del__ automatically - it's been that way since Guido implemented it [2], but Guido's comment in that commit message about not needing a wrapper because types written in C can't define tp_del is clearly no longer accurate. [1] http://hg.python.org/cpython/file/2.7/Objects/genobject.c#l328 [2] http://hg.python.org/cpython/annotate/71dca7c76fa2/Objects/typeobject.c#3955 ---------- nosy: +gvanrossum versions: +Python 3.4 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue17468> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
