confused about python decorators. When/how are they called?

This question already has an answer here:

  • How to make a chain of function decorators? 15 answers

  • @memoize
    def fibonacci(n):
        ...
    

    Is the same thing as

    def fibonacci(n):
        ...
    
    fibonacci = memoize(fibonacci)
    

    See this stack overflow answer for a detailed explanation on how decorators work.

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