[New-bugs-announce] [issue5184] Add -3 warning for extension types that implement tp_compare but not tp_richcompare

[Mark Dickinson]

New submission from Mark Dickinson <dickinsm at gmail.com>:

See

http://mail.python.org/pipermail/python-dev/2009-February/085809.html

where Nick Coghlan writes:

"I'm wondering if Mark should add the exception he recently removed back
in as a Deprecation Warning when tp_compare is defined, but
tp_richcompare is not. Such a warning should also be present when
running with -3 in 2.7 (assuming it isn't already there)."

A technical difficulty with adding this warning is that various built-in 
types implement tp_compare but not tp_richcompare.  For example:  int, 
long, slice, buffer, instancemethod, cell and bool all do this.

----------
messages: 81371
nosy: marketdickinson, ncoghlan
severity: normal
status: open
title: Add -3 warning for extension types that implement tp_compare but not tp_richcompare
versions: Python 2.6, Python 2.7

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<http://bugs.python.org/issue5184>
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