On Tue, Nov 2, 2010 at 2:10 AM, Hirokazu Yamamoto <ocean-c...@m2.ccsnet.ne.jp> wrote: > Does this really cause resource warning? I think os.popen instance > won't be into traceback because it's not declared as variable. So I > suppose it will be deleted by reference count == 0 even when exception > occurs.
Any time __del__ has to close the resource triggers ResourceWarning, regardless of whether that is due to the cyclic garbage collector or the refcount naturally falling to zero. In the past dealing with this was clumsy, so it made sense to rely on CPython's refcounting to do the work. However, we have better tools for deterministic resource management now (in the form of context managers), so these updates help make the standard library and its test suite more suitable for use with non-refcounting Python implementations (such as PyPy, Jython and IronPython). Cheers, Nick. -- Nick Coghlan | ncogh...@gmail.com | Brisbane, Australia _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
