super(type, obj): obj must be an instance or subtype of type
python
Solution
Another way this error can occur is when you reload the module with the class in a Jupiter notebook.
Easy solution is to restart the kernel.
http://thomas-cokelaer.info/blog/2011/09/382/
Check out @Mike W's answer for more detail.
Problem
Why do I get the following error, and how do I resolve it? TypeError: super(type, obj): obj must be an instance or subtype of type