Python object representation (__str__ vs __repr__ dunder methods and dataclasses)

As per our Pybites tip: the goal of __repr__ is to be unambiguous and __str__ is to be readable.

Or as Ned Batchelder succinctly said: "__repr__ is for developers, __str__ is for customers."

We also show how you need to add both dunder / special methods to a class of our own, because it will enhance debugging.

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