Use API:

import maya.OpenMaya as om
selection = om.MSelectionList()
om.MGlobal.getActiveSelectionList( selection )
iter = om.MItSelectionList( selection, om.MFn.kMesh )
dagPath = om.MDagPath()
if iter:
    while not iter.isDone():
        iter.getDagPath( dagPath )
        meshFn = om.MFnMesh(dagPath)
        #Get UVSets for this mesh
        UVSets = []
        status = meshFn.getUVSetNames( UVSets )
        #Get all UVs for the first UV set.
        u = om.MFloatArray()
        v = om.MFloatArray()
        meshFn.getUVs( u, v, UVSets[0] )
        print u
        print v
        iter.next()

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