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Thu Mar 8 02:39:40 CET 2012 · https://mail.python.org/pipermail/python-dev/2012-March/117409.html

Hi,

During the Language Summit 2011 (*), it was discussed that PyPy and
Jython don't support non-string key in type dict. An issue was open to
emit a warning on such dict, but the patch has not been commited yet.

I'm trying to Lib/test/crashers/losing_mro_ref.py: I wrote a patch
fixing the specific issue (keep a strong reference to the MRO during
the lookup, see #14199), but I realized that the real problem is that
we allow custom objects in the type dict.

So my question is: what is the use case of such dict? Why do we still
support it? Can't we simply raise an error if the dict contains
non-string keys?

(*) http://blog.python.org/2011/03/2011-language-summit-report.html

Victor

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[Python-Dev] Non-string keys in type dict