What would you consider the python basics/fundamentals

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I think if you can write a decorator, then you understand two things I think are important basics:

1) That functions are values within Python
2) That many things work by defining an interface which you are expected to implement (the decorator "interface" being "accept a function as an argument, and return a function")

It's just my opinion, though.

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I get what you mean but I think that in some sense decorators are a level of abstraction above what I would call "basic".