Comments on: Overriding Operators in New-Style Classes

By: Ian Bicking

Ian Bicking — Thu, 01 Jan 1970 00:00:00 +0000

No — I think you’re close to having it work. But what you are doing in __init__ now, you have to do in the metaclass. And you have to turn Operator into a descriptor, with a __get__ that binds the instance (as opposed to now, where you are binding the instance in __init__). I don’t know it well enough to do it off the top of my head, but it’s not many more lines of code than you have already.

You could also probably do it with a metaclass, lambda, and default arguments.

By: Lao

Lao — Thu, 01 Jan 1970 00:00:00 +0000

Well, color me corrected. For one reason or another, I had never thought of using a descriptor. This made it impossible to setup a metaclass, since I needed access to the instance object _and_ the operator information at a later time. With your helpful suggestion, it was pretty easy to adjust the code to work properly – my entire matrix test suite ran as soon as I finished typing.

Thanks, I’ll be posting an update to this in a few minutes.