[Python-Dev] isinstance() on old-style classes in Py 2.7

[Barry Warsaw]

On Oct 21, 2014, at 10:13 AM, Guido van Rossum wrote:

>For new code, and whenever you have an opportunity to refactor old code,
>you should use new-style classes, by inheriting your class from object (or
>from another class that inherits from object).

One nice way to do this module-globally is to set:

__metaclass__ = type

at the top of your file.  Then when you're ready to drop Python 2, it's an
easy clean up.

Cheers,
-Barry