Web Reference: The first function (the commented one) will generate an error because the optional parameter "a" was before the required parameter "b." But the second definition would definitely work. Oct 27, 2025 · You define Python functions with optional arguments to make them flexible and reusable. By assigning default values, using *args for variable arguments, or **kwargs for keyword arguments, you let your functions handle different inputs without rewriting code. Jul 23, 2025 · In Python, functions can have optional parameters by assigning default values to some arguments. This allows users to call the function with or without those parameters, making the function more flexible.
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