Python Basics Classes Dunder __add__ __matmul__ __getitem__
Today we are wrapping up a few Python basics with two dunder methods. First is __add__, so when you add two objects, you can return a new one with combined data, like a name made from self.name plus other.name. Then we look at the matrix multiply operator, the at symbol, which uses __matmul__.
It is weird that Python uses double underscores, but that is how the language marks special methods. The cool part is the power: you can overload operators and make your classes act like built in types. While building matrix multiplication by hand, we hit a common bug: list indices must be integers, not lists, so you often need enumerate when you want indexes.
Most of the time you would use NumPy, but writing it once helps you understand what is really happening.
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