import pymel.core as pm

sel = pm.selected()
for mesh in sel:

    # Copy current UV map
    foo = pm.polyUVSet(mesh, q=True, auv=True)
    if len(foo) > 1:
        # Delete anything not map1
        for map in foo:
            curr = str(pm.polyUVSet(mesh, q=True, cuv=True)[0])
            if curr != 'map1':
                pm.polyUVSet(mesh, d=True, uvSet=curr)