UV.U() in Python Script

I am trying to use the node UV.U/UV.V inside a python script with no success as I get an eror as follow:
getset_descriptor is not callable

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What is the corret way to call such function inside a python script in dynamo?

I haven’t really used any designscript nodes inside python, but the error implies that you are trying to call a property as if it were a method. Your input is a list of UV objects, each of which has a U property and a V property. Rather than writing UV.U(dat[0]) it should most likely be dat[0].U.