The `registerFunction` method in `qgis.core.QgsExpression` is used in Python to register a custom function that can be used within QGIS expressions. This method allows users to define their own functions and make them available for use in expressions in QGIS. By registering a function, it becomes accessible in the expression editor and users can utilize it for data processing, calculations, or other tasks. This provides flexibility and customization options for working with expressions in QGIS.
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