[New-bugs-announce] [issue7845] complex.__lt__ should return NotImplemented instead of raising TypeError

[Mark Dickinson]

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

Currently in py3k, order comparisons for complex numbers raise a TypeError.  This was necessary in Python 2.x in order to make a complex <-> complex comparison raise an exception.  In 3.x, it's no longer necessary, since if both sides of a comparison return NotImplemented the result of the comparison is a TypeError (in 2.x the result is a value based on comparing the ids).

In py3k, complex.__lt__ could be changed to always return NotImplemented.  This would allow a custom class to implement its own comparisons with complex, and would remove an unnecessary special case.

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assignee: mark.dickinson
components: Interpreter Core
messages: 98783
nosy: mark.dickinson
priority: normal
severity: normal
status: open
title: complex.__lt__ should return NotImplemented instead of raising TypeError
type: behavior
versions: Python 3.2

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7845>
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