Georg Brandl wrote:

Since I cannot imagine a scenario where you would want to have non-classes
as the arguments of issubclass(),

I had one today, which is what led me to discover this.
I'm working on a Python-Ruby bridge that wraps Ruby
objects and classes in Python objects.

I wanted to make isinstance() and issubclass() work in
the expected way when applied to wrappers around Ruby
classes. The ability to fake things using __classes__
and __bases__ turned out to be very handy.

--
Greg
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