Python decorators are a powerful feature allowing for the addition of extra functionality to functions or methods without directly modifying their source code. Decorators are defined as functions that take another function as an argument, add functionality, and return the modified function. By applying a decorator to a specific function, its behavior can be altered, as demonstrated with a logging decorator modifying the functionality of a say_hello function. Decorators can also be stacked and applied to multiple functions to add diverse functionalities. Understanding decorators enables the creation of cleaner, modular code and harnesses the full potential of Python's dynamic nature.
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