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User-Defined Function ○꠹｜Definition｜1st｜20260918151305-00-⌔

User-defined function - Wikipedia

User-defined function

A user-defined function (UDF) is a function provided by the user of a program or environment, in a context where the usual assumption is that functions are built into the program or environment.1 UDFs are usually written for the requirement of its creator.

Printed 2026-09-18.

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Footnotes

  1. “User-Defined Functions (UDFs)”. pandas documentation. v3.0.5. July 22, 2026. Archived from the original on 2026-07-20. Retrieved 31 July 2026. In pandas, User-Defined Functions (UDFs) provide a way to extend the library’s functionality by allowing users to apply custom computations to their data. While pandas comes with a set of built-in functions for data manipulation, UDFs offer flexibility when built-in methods are not sufficient. ↩

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