Python - OOP - Observer Pattern

In this video I demo you how to implement and use the so called 'Observer' pattern in python.

[rolfjohansen]

Thanks for the good video. I wish the notified object also could trigger a callback function with information from that object in the callback parameter.

[mhdimhdi]

I think you made a mistake in the Observer class in notify method you printing a variable named topic that dont exist
make other instances of the Topic class with other names and you will see