Web Reference: Jul 12, 2025 · A User-Defined Function (UDF) is a function created by the user to perform specific tasks in a program. Unlike built-in functions provided by a programming language, UDFs allow for customization and code reusability, improving program structure and efficiency. Creating a Function In Python, a function is defined using the def keyword, followed by a function name and parentheses: Learn what user-defined functions are and how to write and use them in Python. See an example of a function that adds two numbers and returns the result.
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