[Python-Dev] [Python-checkins] peps: Pre-alpha draft for PEP 435 (enum). The name is not important at the moment, as (original) (raw)

Terry Reedy tjreedy at udel.edu
Tue Feb 26 15:50:00 CET 2013

On 2/25/2013 12:35 PM, Ethan Furman wrote:

But this I don't, and in both mine, Ted's, and Alex's versions enums from different groups do not compare equal, regardless of the underlying value. Of course, this does have the potential problem of green == 1_ _== bee but not green == bee which would be a problem with set and dicts -- but I'm the only one who has brought up that issue.

I have not been following the discussion in detail so I missed that before. Breaking transitivity of equality a no-no. It is basic to thought and logic.

decimal(0) == 0 == 0.0 != decimal(0) was a problem we finally fixed by removing the inequality above. http://bugs.python.org/issue4087 http://bugs.python.org/issue4090

We should NOT knowingly re-introduce the same problem again! If color and animal are isolated from each other, they should each be isolated from everything, including int.

-- Terry Jan Reedy

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