An ArcGIS user is writing a Python script that will update the geometry of all...

make feature layers from a selection o' each input geometry that can be used as system tool inputs

open an update cursor on the input layer and make in_memory feature classes for each feature that can be used as system tool inputs

open an update cursor on the input layer and read its shapes as geometry objects that can be used as system tool inputs

export input feature geometries to OGC WKT (OpenGIS Well Known Text) values in a spatial database and use OpenOIS spatial operators to calculate new geometries