A list of sources for understanding and better using Python decorators.
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Awesome Python decorator An extensive list of usage examples of decorators.
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https://www.python.org/dev/peps/pep-0318/ besides usage examples, gives an overal look
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cached-property freeze functions (https://github.com/pydanny/cached-property)
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decorator module useful decorators, one of them converts caller function to decorator (https://github.com/micheles/decorator)
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A easy to follow tutorial when learning decorators, I watched this one first. It is explained by Coray Schaffer, his tutorials other tutorials worth to look as well.