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Positional arguments in Python functions are provided in the order defined in the function's definition. Conversely, keyword arguments are specified by explicitly stating the name of the parameter and its value, allowing arguments to be passed in any order. Positional arguments are best used when the order is known and consistent, while keyword arguments increase code readability and flexibility, especially when dealing with functions with many parameters or default values .

Methods within Python classes enhance code organization and reuse, supporting encapsulation by associating behaviors with the data they operate on. This aids in abstraction, making complex systems easier to manage. However, it might introduce overhead through increased complexity and design rigidity. Over-reliance on object-oriented principles can lead to overly abstract code architectures that may not align with Python's flexibility. Balancing object-oriented and functional paradigms often yields code that is both efficient and maintainable .