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Use this tag for topics related to custom functions, which are user-defined expression functions usable from the Field Calculator in QGIS.

QGIS allows the definition of user-defined expression functions in Python that can be eventually used in combination with the other built-in expressions. They are created from the Function Editor tab in the Field Calculator.

For additional reference, please see the QGIS Documentation.

Code Language (used for syntax highlighting): lang-py