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. In this tutorial, you will find the advantages of using user-defined functions and best practices to follow. Jun 6, 2024 · In Python, a user-defined function's declaration begins with the keyword def and followed by the function name. The function may take arguments (s) as input within the opening and closing parentheses, just after the function name followed by a colon.
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