How to Write a Decorator with an Optional Argument?

The author explores the challenge of creating a Python decorator that accepts optional arguments, sharing their journey through various attempts and solutions. Initially, they tried using a function-based decorator with three levels of functions, allowing for an argument but failing without one. A class-based decorator provided similar results, failing without an argument. Eventually, the author found success by adapting a solution from the "Python Cookbook" using the `partial()` function, which simplifies function signatures by "freezing" some arguments, enabling the decorator to work with or without arguments. The solution, though initially complex to understand, effectively allows for optional arguments, enhancing the decorator's versatility. The author encourages readers to apply these insights to create more adaptable decorators in Python.

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