On Mon, Jul 22, 2013 at 2:44 PM, Ben North <b...@redfrontdoor.org> wrote:
> Hi, > > A friend of mine, Ruadhan O'Flanagan, came across a bug which turned out > to be the one noted in [http://bugs.python.org/issue18019], i.e.: > > >>> d={} > >>> d[42]=d.viewvalues() > >>> d > <segmentation fault> > > This issue has been fixed in hg; the behaviour now is that a > RuntimeError is produced for a recursive dictionary view: > > >>> d={} > >>> d[42]=d.viewvalues() > >>> d # (output line-broken:) > {42: Traceback (most recent call last): > File "<stdin>", line 1, in <module> > RuntimeError: maximum recursion depth exceeded > while getting the repr of a list > > Before finding this, though, I'd investigated and made a patch which > produces a similar "..." output to a recursive dictionary. Reworking > against current 2.7, the behaviour would be: > > >>> x={} > >>> x[42]=x > >>> x # existing behaviour for dictionaries: > {42: {...}} > > >>> d={} > >>> d[42]=d.viewvalues() > >>> d # new behaviour: > {42: dict_values([...])} > >>> d[43]=d.viewitems() > >>> d # (output line-broken:) > {42: dict_values([..., dict_items([(42, ...), (43, ...)])]), > 43: dict_items([(42, dict_values([..., ...])), (43, ...)])} > > Attached is the patch, against current 2.7 branch. If there is interest > in applying this, I will create a proper patch (changelog entry, fix to > Lib/test/test_dictviews.py, etc.). > Mailing lists are where patches go to get lost and die. :) Post it on an issue on bugs.python.org. Given that the RuntimeError fix has been released, your proposed ... behavior is arguably a new feature so I'd only expect this to make sense for consideration in 3.4, not 2.7. (if accepted at all) -gps > > Thanks, > > Ben. > > _______________________________________________ > 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/greg%40krypto.org > >
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