[Python-Dev] operator precedence of eq, ne, etc, if both object have implementations (original) (raw)

Dino Viehland dinov at microsoft.com
Tue Sep 22 23:55:27 CEST 2009

Willem wrote:

It's easy for other implementations to get this wrong. :)

For IronPython we wrote a set of tests which go through and define the various operator methods in all sorts of combinations on both new-style and old-style classes as well as subclasses of those classes and then do the comparisons w/ logging.

We've got this for both comparisons and the normal binary operators. We've also done it in other areas such as throwing exceptions and other complicated areas. But having the the coercion rules documented still helped a lot (although my recollection is they were only about 95% right).

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