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Wed Apr 5 02:46:53 CEST 2006 · https://mail.python.org/pipermail/python-dev/2006-April/063423.html

Crutcher Dunnavant wrote:

> A) issubclass() throws a TypeError if the object being checked is not
> a class, which seems very strange.

If I ever pass a non-class to issubclass() it's almost
certainly a bug in my code, and I'd want to know about
it.

On the rare occasions when I don't want this, I'm
happy to write

   isinstance(c, type) and issubclass(c, d)

> B) issubclass() won't work on a list of classs,
 > the way isinstance() does.

That sounds more reasonable. I can't think of any
reason why it shouldn't work.

--
Greg

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[Python-Dev] Should issubclass() be more like isinstance()?